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About this place
Obere Heidenburg is an early medieval earthwork site near Oberwil, in the municipality of Nürensdorf in the canton of Zurich, on a hill east of the village of Birchwil. There are no walls or towers to see; what survives is the ground plan itself, a moat and a rampart.
What is the Obere Heidenburg?
The name roughly means "Upper Heathen Fort". Locals gave it to one of two neighbouring watchtower sites on the same hill, the Obere (upper) and the Untere (lower) Heidenburg. Researchers link the complex to the late Roman period and the early Middle Ages.
What did it look like?
The upper site has a round central platform ringed by a moat, with an earth bank about 7 m wide outside it. The lower one is better known: a square platform of 16 x 16 m, a moat 7 m wide and 1.7 m deep, and a small 3 x 3 m watchtower in the middle.
When and why was it built?
A fourth-century pottery shard found in 1966 shows people were here in late antiquity. Burgenwelt.org links both sites to a chain of watchposts along the old road from Baden to Winterthur. In the Carolingian era (8th to 9th century), according to the same source, it was rebuilt: the square earthworks were turned into a motte, a mound topped with a timber castle. No written records mention the place, so everything rests on fieldwork.
Who investigated it?
Ferdinand Keller, a pioneer of Swiss archaeology, published plans of both sites in 1869. The lower Heidenburg was excavated in 1937. The upper one is less documented and remains more puzzle than settled history.
Who is it for?
Archaeology and castle enthusiasts, and anyone who enjoys quiet walks through Zurich's woods and farmland. Expect a readable pattern of ditches and banks rather than a showy ruin. It pairs well with a visit to the lower Heidenburg and the countryside around Birchwil and Nürensdorf, close to Kloten airport.
Frequently asked questions
Is Obere Heidenburg a castle with standing walls? No. Only earthworks remain: a round platform, a moat and a bank.
Where is it? On a hill east of Birchwil in Nürensdorf, near Oberwil, canton Zurich, east of Kloten.
How does it differ from the Untere Heidenburg? The upper site is round, the lower square; only the lower one was excavated (1937).
How old is it? Traces go back to the 4th century, with a Carolingian rebuild according to the literature.
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