Museum Siam | มิวเซียมสยาม พิพิธภัณฑ์การเรียนรู้

Update 2018: I never even knew the exhibitions are temporary, but the excellent original exhibition has now been replaced by something less interesting, less interactive and very nationalistic and boastful. The period costume photo studio is still free and bigger than before, and you can still play typical Thai games, but gone are e.g. shooting a cannon, the TV studio where you could record yourself and the 50ties bar. The costume display room shows an incredibly hierarchical society of 30-40 levels, and of course the lower levels can forget about reaching nirvana any time soon. Not a must-see anymore.

(2009) The museum shows Thai culture and history from prehistoric times until now. Although visually very attractive, the oldest periods are quite general and not that interesting.

The more recent the more exciting, also because most displays are interactive and you're literally allowed to touch and play with everything. Old wooden toys, an ancient canon with which you can shoot at the Burmese (the original enemy), a TV recording studio where you can read the news, which will afterwards be displayed on TV's all over the museum, a 50ties diner with an mini parked in the front, dress up in old-style Thai clothes and much more. A great place to take lots of fun photos.

Bad points are that the interactive games are often broken (I visit regularly), and the interactive displays and videos are sometimes very noisy. Free entry on national holidays and during events.  location * website