NOTE: in the first half of 2016, the Scheepvaartmuseum is used by the Dutch government, as a location for EU meetings (the Netherlands is EU Chairman during this period).

The Maritime Museum of Amsterdam. The collection has a lot of nautical artefacts, related to the Dutch seafaring history.
One of its big attractions is the tall ship the 'Amsterdam', that is located next to the museum, and which can be visited.

There's a large restaurant inside, which can be visited without visiting the museum.

Address:
Kattenburgerplein 1, Amsterdam
Web:
http://www.hetscheepvaartmuseum.nl/

Opening hours:
NOTE: Due to the Dutch EU Chairmanship, the Scheepvaartmuseum has limited opening hours during certain periods:

It is closed for visitors on:
Friday 22 January through Sunday 7 February 2016
Sunday 10 April through Sunday 24 April 2016
Sunday 29 May through Friday 3 Juni 2016

Normal opening hours:

Daily 9-5
Closed on King's Day – 27th of April, Christmas Day – 25th of December, New Year's Day – 1st of January