Sion: 8 Unforgettable Experiences

You’ll discover that Sion isn’t your typical Swiss destination. While most travelers rush past this ancient capital toward the Alps, you’re missing out on one of Europe’s most underrated gems. From climbing medieval castle ruins to exploring underground lakes, this 7,000-year-old city packs more authentic experiences into a few days than most places offer in weeks. Here’s what you need to know about eight experiences that’ll completely change your perspective on Switzerland.

Climb to Château De Tourbillon for Valley Views Worth the Steep Walk

Why settle for street-level views when you can conquer Sion’s highest peak for breathtaking panoramas? The steep climb to Château de Tourbillon rewards you with spectacular 360-degree views over the Rhône Valley and surrounding mountains. You’ll need solid footwear for the rocky path leading 182 meters above the city to these 13th-century ruins.

Once there, explore the remains of Bishop Boniface de Challant‘s former fortress, including the preserved chapel choir with stunning early 14th-century murals. The castle’s strategic position offers unique photo opportunities of the neighboring Valère Basilica and valley below. Though destroyed in a devastating town fire in 1788, the ruins have been carefully stabilized to preserve this historic landmark.

Visit between 10 AM and 6 PM, ideally during spring or early autumn when temperatures make the ascent more comfortable. Pack water and use restrooms in town beforehand.

Experience Valère Basilica and Its 600-Year-Old Pipe Organ

While Château de Tourbillon offers sweeping views from its ruins, neighboring Valère Basilica presents an entirely different treasure—one of the world’s oldest playable pipe organs nestled within a remarkably preserved medieval fortress-church.

You’ll discover this Romano-Gothic basilica dating from the 12th-13th centuries, where canons once governed alongside bishops. The real marvel awaits inside: a 600-year-old organ from 1430-1437 that’s still in working condition. Its pipes are uniquely arranged in a church-like formation, with Baroque additions from the 18th century.

Visit during museum hours (11:00-18:00 summer, 11:00-17:00 winter) to explore the nave freely. You can catch special concerts featuring this ancient instrument, or join guided tours that reveal the basilica’s rare 13th-century rood screen and medieval artwork. The fortress also houses the Valais History Museum, which showcases the region’s rich cultural heritage through exhibits spanning different historical periods.

Explore Europe’s Largest Underground Lake at Lac Souterrain

Thirty meters beneath the vineyards between Sion and Sierre lies Europe’s largest navigable underground lake—a 300-meter crystalline wonder that’s remained hidden from sunlight for millions of years. You’ll descend fifty steps to reach the jetty, where guides lead thirty-minute rowing boat tours through this geological marvel.

The lake’s crystal-clear waters maintain a constant 11°C temperature, revealing underwater limestone formations and cave-dwelling trout swimming beneath your boat. Formed by millions of years of groundwater dissolving Triassic gypsum, this subterranean world features dramatic marble walls and stalactites emerging from the depths. The experience relies on artificial lighting to illuminate the cavern’s features, though the natural darkness would make the lake’s character even more impressive.

Your guide shares fascinating details about the 1943 discovery and the 1946 earthquake that lowered water levels, making tourism possible. With 80,000 annual visitors, it’s Switzerland’s most remarkable underground experience.

Hike the Bisse De Torrent Neuf Trail With Its Suspended Boardwalks

Above ground from Sion’s subterranean wonders, the Bisse De Torrent Neuf Trail offers an entirely different adventure that’ll test your nerves while rewarding you with spectacular valley views. This 8-kilometer heritage trail follows a 15th-century irrigation channel, featuring narrow suspension bridges that sway as you cross them along cliff edges.

You’ll start with a steep 200-meter climb near Brac, but the path becomes easier afterward.

The trail showcases traditional engineering without iron nails, plus historical displays explaining the bisse’s construction.

Don’t miss Notre Dame du Torrent Neuf, a small chapel built into the rock near the suspension bridges.

The round trip takes 4-5 hours, and while it’s classified as easy-moderate, it’s not suitable if you’re afraid of heights. After the second suspension bridge, you’ll find picnic tables where you can rest and take in the dramatic mountain scenery.

Children need close supervision due to steep drop-offs.

Taste Valais Wines in the Vineyards Above Old Town

After exploring Sion’s trails and historical sites, you’ll discover that the steep terraced vineyards cascading down the mountainsides above Old Town offer some of Switzerland’s most exceptional wine experiences.

These southeast-facing slopes maximize sun exposure and create perfect conditions for cultivating Chasselas, Petite Arvine, and Pinot Noir at altitudes reaching 1,100 meters.

You can visit Les Celliers de Sion for guided tours and free tastings of 16 local wines, or explore family-run wineries like Maison Gilliard for cellar tours.

Don’t miss tasting Sion’s Grand Cru wines—Fendant, Ermitage, Dôle, and Syrah—which meet strict quality standards. These wines must pass a tasting panel to receive their prestigious designation.

The vineyards’ proximity to Old Town makes it easy to combine cultural sightseeing with wine discovery in one unforgettable day.

Wander Sion’s 7,000-Year-Old Streets and Friday Market

Following your wine tasting adventure, you’ll want to explore the cobblestone streets below those same vineyards, where Sion’s Old Town spreads across one of Switzerland’s most ancient inhabited sites. These medieval lanes preserve 7,000 years of continuous settlement history, with grooves in the cobblestones marking where the old Sionne river once flowed.

Time your visit for Friday morning when the Marché de la vieille ville transforms Rue du Grand-Pont into a lively marketplace. From 8:00 AM to 2:00 PM, local Valais producers fill the pedestrian streets with fresh cheeses, artisanal crafts, and regional wines. This beloved tradition was revived in 2003 through community efforts to preserve local customs and support regional artisans.

You’ll discover pop-up wine stands offering tastings, handmade goods, and ready-to-eat specialties while soaking up the convivial atmosphere that makes this weekly market a local favorite.

Visit Three Essential Museums in One Historic District

While the Friday market gives you a taste of Sion’s living culture, the city’s three essential museums reveal the deeper layers of Valais heritage within a compact historic district. You’ll find the Valais History Museum nestled within Valeria Castle, where over 1,000 artifacts trace regional history from Paleolithic times to the Industrial Revolution. The world’s oldest functioning organ adds an unexpected musical dimension to your visit.

Next, explore the Valais Art Museum across eight floors in two interconnected historic buildings. You’ll discover works by Marina Abramović and Oskar Kokoschka while wandering through medieval Bishop’s Castle rooms.

Finally, visit the Valais Nature Museum at Montorge’s protected lakeside site, where 8,000 animal specimens showcase local biodiversity. The museum features fascinating Mesolithic artifacts that provide insight into the region’s earliest human inhabitants. Best of all, you’ll enjoy free admission to all three museums.

Take Day Trips to Matterhorn Glacier Paradise and Gornergrat

Why settle for admiring the Matterhorn from Sion’s streets when you can reach Europe’s highest cable car station and witness this iconic peak up close? The journey to Matterhorn Glacier Paradise takes 40-45 minutes from Zermatt, involving gondola transfers through Furi, Schwarzsee, and Trockener Steg.

At 3,883 meters, you’ll experience breathtaking 360-degree views of 38 peaks over 4,000 meters and 14 glaciers spanning three countries.

Don’t miss the Glacier Palace beneath Theodul Glacier, featuring centuries-old ice sculptures and formations.

Plan 3-4 hours for the complete experience, including the viewing platform, cinema, and Europe’s highest mountain restaurant. Since Zermatt is a car-free zone, visitors must take bus 571/572 from the train station to reach the cable car base.

Dress warmly year-round and bring sturdy footwear for icy conditions.

Book tickets online to avoid 45-minute queues during peak seasons.

The Sum Up

You’ll discover Sion perfectly balances ancient history with alpine adventure. Whether you’re climbing medieval castle ruins, exploring underground lakes, or sipping local wines with mountain backdrops, each experience reveals why this Swiss valley town captivates visitors. Don’t rush through—Sion’s 7,000-year heritage deserves time to appreciate. Pack comfortable walking shoes, bring your camera, and prepare for a destination that’ll surprise you with its depth beyond typical Swiss stereotypes.