This Unesco-recognised landmark house is just east of the city centre. Built in 1924 by Utrecht architect Gerrit Rietveld for socialite Truus Schröeder-Schräder, it is a stark example of ‘form follows function.' Especially notable are the architect's use of primary colours and the transitions between interior and exterior. Visits are by mandatory tour, best booked in advance online.
Nearby, on Erasmuslaan, are a pair of social housing blocks also designed by Rietveld. It's a 20-minute walk east of the town centre.