The Sanctuary of Truth (Thai: ปราสาทสัจธรรม) is an unfinished museum in Pattaya, Thailand, which is a hybrid of a temple and a castle based on the Ayutthaya period and Buddhist, Hindu beliefs. It was designed by the Thai businessman Lek Viriyaphan in the Ayutthaya style. The Western hall features representations of the classical elements (earth, water, wind, and fire) and sculptures of the Hindu Trinity: Lord Brahma, Vishnu, and Shiva, the gods who conquer the four elements.

The building is notably constructed entirely out of wood, specifically Mai Deang, Mai Takien, Mai Panchaat, and Teak, and it contains only wood-carved idols and sculptures. The sanctuary is made of several different types of wood, giving different parts of the sanctuary different textures. The oldest wood that has been used is takien wood, used to build the main post and expected to last for 600 years. Construction first began on the Sanctuary of Truth in 1981 and continues as of 2021, though visitors are permitted inside with hard hats.

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