Thermal Destination
Good to Know
Badenweiler · Germany
Tucked into the sunny foothills of the southern Black Forest, Badenweiler is a gentle spa town where Romans first took the waters almost two thousand years ago. Today its glass-roofed bath ruins and the modern Cassiopeia Therme sit side by side, a few sheltered minutes from vineyards, fir forests and the borders of France and Switzerland.
Getting there
The closest international airport is Basel-Mulhouse-Freiburg (MLH/EAP/BSL), roughly 30 km away; Karlsruhe/Baden-Baden (around 142 km) and Frankfurt (around 297 km) are the larger alternatives. By rail, take an ICE to Freiburg, then a regional train to Müllheim (Baden), the gateway station for Badenweiler. From Müllheim a short taxi or shuttle (about €20–25) brings you up into town; transfers from Basel or Freiburg run nearer €95.
Best time to visit
Badenweiler enjoys an unusually mild microclimate: warm air drifts up from the south while the Black Forest shelters the town from cold winds and sharp temperature swings. Late spring through early autumn is the sweet spot for hiking, cycling and the vineyards, though the thermal baths make Badenweiler a rewarding year-round retreat — the quieter winter months are ideal for pure spa and sauna days.
What to see
The star attraction is the Roman Bath Ruins (Römische Badruine), the best-preserved Roman spa north of the Alps, excavated in 1784 under Margrave Carl Friedrich of Baden and now protected beneath a striking glass roof. Pair it with the neighbouring Cassiopeia Therme, then explore the surrounding Markgräflerland — often called the ‘Tuscany of southern Germany’ — with its sun-drenched vineyards, the Rhine plain, and easy day trips to Alsace, Colmar, Strasbourg, Basel and the Swiss Alps.
Healing water, ancient and modern
Around one million litres of warm spring water surface in Badenweiler every day at a gentle 26.4 °C, naturally rich in minerals that ease rheumatic and inflammatory complaints. The Cassiopeia Therme channels that tradition across 3,800 sqm of thermal pools, saunas and a Roman-Irish bath — wellness inspired by a bathing culture more than 2,000 years old.
Roman Aquae Villae
The best-preserved Roman bath north of the Alps
Beside the spa park stand the excavated Roman baths the legions knew as Aquae Villae. Uncovered in 1784 and now sheltered beneath a sweeping glass roof, their pools, channels and hypocaust walls trace the same waters that still rise warm in Badenweiler today.
Plan your stay
Find the right base for your Black Forest spa break — hotels for every style, all within strolling distance of the therme.Where to stay in Badenweiler