Introduction
Welcome to Bellinzona, where three medieval castles guard the narrow gateway to the Alpine passes. This UNESCO World Heritage Site is the most impressive example of medieval military architecture in the Alps, a defensive system so complete and so well preserved that it still conveys the awesome power it wielded when it controlled access between northern and southern Europe.
Bellinzona sits at the narrowest point of the Ticino Valley, where the valley floor squeezes to just a few hundred metres between steep mountain walls. Whoever held this bottleneck controlled the approaches to the St. Gotthard Pass, the San Bernardino Pass, and the Lucomagno Pass, three of the most important Alpine crossings. For centuries, the Dukes of Milan and the Swiss Confederates fought bitterly over this strategic prize, and the three castles that crown Bellinzona's hilltops are the physical legacy of that struggle.
This walk ascends from the valley floor to the highest castle in a demanding but exhilarating climb that takes you through nearly a thousand years of military history and offers increasingly spectacular views of the Ticino Valley, the surrounding mountains, and the urban landscape of one of Switzerland's most Italian cities.
Stop 1: Castelgrande — 46.1945, 9.0187
Begin at Castelgrande, the oldest and most central of the three fortifications. This castle occupies a rocky promontory that rises steeply from the valley floor, commanding the entire width of the Ticino Valley. Archaeological evidence shows that this hilltop has been fortified since the late Bronze Age, over three thousand years ago.
The current structures date primarily from the thirteenth to fifteenth centuries, when the castle was repeatedly enlarged and strengthened by the Dukes of Milan. The two massive towers that define Castelgrande's skyline are the Torre Bianca (White Tower, 27 metres) and the Torre Nera (Black Tower, 28 metres). Despite their names, both are built of grey granite; the names derive from their historical associations rather than their colour.
Castelgrande was extensively restored in the 1980s and 1990s by the Ticino architect Aurelio Galfetti, whose modernist interventions are widely admired. Galfetti added a public elevator and stairway that ascend through the rock from the valley floor, providing access for visitors who cannot manage the steep climb. His work respects the medieval fabric while adding clean, contemporary elements that enhance rather than compete with the historic architecture.
Walk through the castle grounds, which have been landscaped as a public park. The lawns and terraces occupy the area between the defensive walls, and the views from the ramparts encompass the entire Ticino Valley: the river winding through the valley floor, the vineyards on the lower slopes, and the mountains rising steeply on both sides.
Stop 2: The Murata — Defensive Wall System — 46.1935, 9.0205
From Castelgrande, look south and east. The defensive walls that once linked the three castles are partially visible, running in great sweeps down the hillsides and across the valley floor. This wall system, the Murata, was the key to Bellinzona's defensive strategy.
The Murata consisted of multiple curtain walls that spanned the valley from side to side, blocking any army attempting to march through. Each wall was punctuated by towers and gates, and each castle served as a strongpoint that anchored a section of the defenses. The result was a series of barriers that an invader had to breach one after another, each assault made more costly by flanking fire from the castles above.
At its fullest extent, the wall system stretched across the entire valley, from the mountains on the western side to the mountains on the eastern side, creating a barrier that was virtually impenetrable by medieval military means. The walls were thick enough to resist battering rams and high enough to prevent escalade, and the towers provided platforms for archers and crossbowmen to sweep the approaches with deadly fire.
Much of the Murata has been destroyed over the centuries as the town expanded, but significant sections survive, particularly on the hillsides between the castles. These surviving sections give a vivid impression of the scale and ambition of the defensive system.
Stop 3: Piazza della Collegiata — 46.1928, 9.0210
Descend briefly to the town centre to cross through the Piazza della Collegiata, the main square of Bellinzona's old town. This Italian-flavoured piazza, with its arcaded buildings, cobblestone paving, and cafe terraces, is a reminder that Bellinzona is culturally and linguistically Italian, even though it has been politically Swiss since 1503.
The Collegiate Church of Saints Peter and Stephen dominates the square. This Renaissance church, built in the fifteenth and sixteenth centuries, features a facade that blends Gothic and Renaissance elements and an interior of considerable richness, with frescoed ceilings and Baroque altarpieces.
Bellinzona's Italian character is visible everywhere: in the shuttered facades painted in warm ochre and terracotta, in the language spoken on the streets, in the open-air market that fills the square on Saturday mornings with Mediterranean produce. The weekly market is one of the largest in Ticino, and the stalls overflow with cheeses, salami, fresh pasta, olive oil, and local wines.
Stop 4: Ascent to Castello di Montebello — 46.1920, 9.0235
The path to Montebello climbs steeply from the old town, switchbacking through a neighbourhood of medieval and Renaissance houses before reaching the castle walls. The climb is about 90 metres of elevation gain and takes fifteen to twenty minutes at a moderate pace.
Castello di Montebello is the middle castle, positioned above and behind Castelgrande on a higher spur of the hillside. Built in the late thirteenth century by the Rusca family, local lords who contested control of Bellinzona with the Milanese Visconti, it was later enlarged and strengthened by the Visconti and the Sforza dukes who succeeded them.
The castle's architecture shows the evolution of fortification design over three centuries. The earliest section is a compact, irregular enclosure with a central keep, typical of thirteenth-century castle building. Later additions include a larger outer ward with circular towers at the corners, reflecting the fifteenth-century response to the increasing power of siege artillery.
The castle museum houses an important collection of archaeological finds from the region, including Bronze Age and Iron Age objects that document the strategic importance of the Ticino Valley in prehistoric times. The exhibits demonstrate that the pass routes through the Alps were used for long-distance trade thousands of years before the Romans built their roads.
Stop 5: Montebello Terrace Viewpoint — 46.1918, 9.0240
The terrace at the eastern side of Montebello offers the finest view of the castle system as an integrated whole. From here, you can see all three castles simultaneously: Castelgrande below and to the west, Montebello around you, and Sasso Corbaro above and to the east.
The strategic logic of the three-castle system becomes clear from this vantage point. The castles are positioned to provide mutual support: each can see the others, and an attacker targeting one castle would be exposed to fire from the other two. The walls connecting them created a series of enclosed spaces that could be defended independently, so that even if one section fell, the defenders could withdraw to the next.
The Swiss Confederates captured Bellinzona in 1500, taking advantage of a period of Milanese weakness following the French invasion of Italy. They held the town until 1503, lost it briefly, and then recovered it permanently. The three castles were divided among the three original forest cantons: Castelgrande went to Uri, Montebello to Schwyz, and Sasso Corbaro to Unterwalden. This tripartite division, typically Swiss in its insistence on shared governance, lasted until the end of the old regime in 1798.
Stop 6: Path to Sasso Corbaro — 46.1905, 9.0260
The climb from Montebello to Sasso Corbaro is the most demanding section of the walk: a steep, winding path that gains another 100 metres of elevation through chestnut forest and terraced gardens. The effort is rewarded by the isolation and dramatic position of the highest castle.
As you climb, the vegetation changes. The lower slopes are covered with vineyards and olive trees, reflecting the Mediterranean climate of the Ticino Valley. Higher up, chestnut trees predominate, their broad canopies creating a shaded, cathedral-like atmosphere. Chestnuts were once a staple food in Ticino, ground into flour for bread and polenta, and the chestnut forests were carefully managed as an essential resource.
The path passes through areas where the Murata wall once ran, and you may see fragments of the medieval masonry emerging from the vegetation. The wall sections between Montebello and Sasso Corbaro are among the best preserved, and their massive construction speaks to the importance the builders placed on connecting the highest castle to the defensive system below.
Stop 7: Castello di Sasso Corbaro — 46.1890, 9.0285
Sasso Corbaro is the most dramatically positioned of the three castles, perched on an isolated rocky outcrop high above the valley. Unlike the other two castles, which grew organically over centuries, Sasso Corbaro was built in a single campaign, constructed in just six months in 1479 in response to the Swiss Confederates' victory at the Battle of Giornico, which demonstrated the vulnerability of Bellinzona's existing defenses.
The castle is compact and severe, its plan a simple rectangle with a tall keep at one corner and cylindrical towers at the others. The speed of construction is evident in the rougher masonry and the utilitarian design, which prioritised defensive function over architectural refinement. But the result is impressive in its brutal efficiency: the walls are immensely thick, the sight lines from the towers are commanding, and the isolated position makes the castle virtually impossible to storm.
The interior houses a small museum and a restaurant whose terrace offers what is arguably the finest view in all of Ticino. The entire Ticino Valley is laid out before you, from the mountains above Biasca in the north to the haze over the Piano di Magadino in the south, where the Ticino River flows into Lake Maggiore. On clear days, the mountains of the Valais are visible to the west, and the peaks of the Lepontine Alps rise to the north.
Stop 8: Panoramic Reflection — 46.1890, 9.0285
Stand on the terrace of Sasso Corbaro and contemplate the view. Below you, the three castles and their connecting walls form a defensive system that controlled one of the most important corridors in European history. Through this valley passed Roman legions, medieval armies, Renaissance merchants, and the flood of traffic that followed the opening of the Gotthard railway in 1882.
The UNESCO designation, awarded in 2000, recognised Bellinzona's castles as an outstanding example of medieval military architecture and a testimony to the strategic importance of the Alpine passes. The three castles and the Murata form a defensive ensemble that has no parallel elsewhere in the Alps, and their preservation is a tribute to the citizens of Bellinzona who have maintained and restored them over centuries.
Conclusion
The three castles of Bellinzona are one of the great cultural experiences of Switzerland. The climb from the valley floor to Sasso Corbaro is demanding, but the combination of military history, architectural drama, and panoramic views makes it unforgettable. Descend by the same route, or take the alternative path that leads directly down to the town centre.
Practical Information
- Best Time: Spring and autumn for comfortable hiking temperatures. Summer mornings before the heat builds. Winter for atmospheric mist in the valley.
- Wear: Sturdy hiking shoes. The paths between the castles are steep and uneven. Sun protection in summer.
- Bring: At least one litre of water. The climb is strenuous. A picnic lunch to enjoy on the Sasso Corbaro terrace.
- Nearby Food: The Saturday market in the Piazza della Collegiata is excellent. The grotto-style restaurants of Bellinzona serve Ticino specialties: risotto, polenta, braised meats, and local Merlot wine.
- Getting There: Direct trains from Zurich (1h50), Locarno (20 min), and Lugano (25 min).