I'm looking for recommendations for really unique or unusual Buddhist temples in Thailand. I already have a few on my list.

Wat Sala Kaew Koo - Nong Khai

Wat Chedi Hoi - Pathum Thani

Wat Phai Rong Wua (hell temple) - Suphanburi

Wat Lan Khuat - Sisaket

What other temples should be on the list and why?