Alt-Biederthal Ruins

Alt-Biederthal Ruins are the remains of a medieval hilltop castle above Burg im Leimental, in the Swiss canton of Basel-Landschaft. The village sits close to the French border, in the quiet, hilly Leimental valley southwest of Basel.

What is Alt-Biederthal, and who built it?

The castle occupied a rocky spur at the western end of the Schönenberg ridge. The Historical Dictionary of Switzerland says the lords of Biederthal founded it in 1168 and that it was given up in the 13th century. Burgenwelt gives a wider span, describing the fortress as inhabited from the 11th to the early 13th century. The Biederthal family appears in records from 1141, so the site is generally seen as their ancestral seat. The village below first took its name from the castle.

The same dictionary links 1168 to the Habsburgs, who received the Biederthal lordship, castle and manorial court complex from Emperor Frederick Barbarossa. In 1269 the Prince-Bishop of Basel bought the castle along with the court in the nearby Sundgau. By the mid-13th century newer strongholds, Neu-Biederthal among them, had been built nearby, and the old seat lost its role.

What will you see?

Do not expect imposing walls. Burgenwelt reports faint traces of masonry on a rock surrounded by a ditch. Hikers on Komoot say the rock itself is impressive and can be climbed with some care, but little wall remains and the overgrown ground makes the ruins hard to pick out. The path near the rock can be tricky to find.

The same ridge holds remains of Schönenberg castle, built in 1230 by the counts of Pfirt and destroyed in 1356. In the village stands Burg castle (Neu-Biederthal), which is privately owned and closed to visitors, though its first gate and outer courtyard can be reached at any time.

How do you get there?

Start at the village square in Burg im Leimental. Follow the marked trail toward Kleinlützel, heading west and uphill. After about 600 metres you reach the first fork, where the route continues to the rock.

By public transport, take tram 10 from Basel SBB to Flüh station, then bus 69 to Burg im Leimental. You can also drive to the village.

When should you go?

It is an open-air site with no opening hours. Dry spring and autumn days work best, when the path is not slippery. Wear shoes with good grip.

Frequently asked questions

Is there an entrance fee? The sources list none; it is an open ruin in the countryside.

Are the ruins well preserved? No. Only faint wall traces and a ditch remain, and the rock itself is the main attraction.

Is this the castle in the village? No. The castle in the village is the later Neu-Biederthal, built in the mid-13th century to replace the old stronghold.

How do I get there from Basel? Take tram 10 to Flüh, then bus 69 to Burg im Leimental.