Wat Chana Songkhram Ratchaworamahawihan, also known as Wat Chana Songkhram (because I dare ya to say the full name), is a Buddhist temple in Bangkok located near Khaosan Road. It has a rich history dating back to before 1782 and was once a center for Mon Buddhism. Renamed to celebrate Thai victories over the Burmese, this temple is now open to visitors every day, free of charge!
If you like, you can purchase a "gift" for the monks who live there and participate in an offering ceremony where a monk thanks you by giving you a water blessing.
Make sure to cover up! Women must cover their shoulders and knees and men just the shoulders.