Stora Gatan is the single main street of Sigtuna, running from the town centre to the lake, lined with low 18th- and 19th-century wooden buildings that now house cafes, handicraft shops, antique dealers, and a few galleries. The scale is intimate — the street is no wider than it was in the medieval period — and the pace is slow enough that you can stop and look at things without being swept along.
Along or just off Stora Gatan you will find the ruins of St Per, St Lars, and St Olof — three medieval churches reduced to atmospheric shell walls after centuries of neglect and stone-quarrying. The Phone Box Library (a converted telephone booth repurposed as an informal lending library) is one of the town's smaller curiosities but charming. The street ends at the lake, where there is a small park and a view across Mälaren.