The National Museum in Bangkok

I went to Bangkok last year and spent few weeks there, and the only museum I visited was the National Museum. It's the largest museum I ever set foot in - they say it's the largest in Asia - and has collectionms and exhibits on everything related to Thailand's history and culture. It's on Th Na Phra That and to get in you'll pay 40 B. Take the ferry to Tha Mahathat to get there