The Sigtuna Rådhus stands on the main square and is a delightful miniature of civic ambition — a tiny 18th-century building with a modest clock tower and classical facade, reportedly the smallest town hall in Scandinavia. It was built in the 1730s when Sigtuna was already a minor backwater, which gives it a certain poignancy.
The building now functions as a museum annex and exhibition space rather than a working administrative centre. Its exterior is more interesting than its interior, but it is one of those buildings that is simply impossible to walk past without stopping to look. The square it faces is the natural meeting point of the town and worth a few minutes of sitting.