If you see only one museum while in Amsterdam, make it The Anne Frank House. Follow this link to find cool things to do in Amsterdam! http://mikestravelguide.com/destinations/things-to-do-in-amsterdam/
The Anne Frank Haus - Amsterdam - The street front entry to the building that housed the business where Anne's father worked prior to moving the family to the upstairs Annex during WW II. The museum entrance is now around the corner.