4 Na Phra That Alley, Khwaeng Phra Borom Maha Ratchawang,

Khet Phra Nakhon, Krung Thep Maha Nakhon 10200

Lat/Long = 13°45'26”N, 100°29'32”E

GPS = 13.7572874, 100.4889935

This is the largest and most complete museum in Thailand however it doesn't have as many Khmer artifacts as the museum in Phimai.  A visit here can be exhausting because there's so much to see.  There are several galleries spread out in 14 buildings but most of the Khmer artifacts are located in Building 1 (Gallery of Thai History) and Building 3 (Thai Art History & Archaeology).  There are a few well-preserved lintels in both buildings.  Building 1 has a very impressive statue of Vishnu with 4 arms.  An excellent stone lion sits outside of the entrance to Building 3.  Building 3 also has a large horizontal lingam.  There's a gift shop next to the ticket booth that has a decent selection of books, including many from River Books.  Admission is 200B for foreigners.

Thai National Museum