This odd, mod building houses both the stadhuis (town hall) and the opera hall, aka Muziektheater , hence the name 'Stopera'. It opened in 1986. For a peek behind the scenes, take a guided tour (adult/child €6/5) on Saturdays at 12.15pm. The arcade between the town hall and the theatre has an intriguing display on NAP , Amsterdam's sea level measurements.
Free lunchtime concerts usually take place from 12.30pm to 1pm on Tuesdays from September to May; doors open at 12.15pm.