Mt Popa. I’m going to copy in the Lonely Planet highlights.
“Considered the spiritual HQ to Myanmar’s infamous ’37 nat’. Mt Popa is the premier venue for worship of these pre-Buddhist spirits and an easy day trip from Bagan.
“A gilded Buddhist temple accessed by 777 steps teeters atop a tower like 2418 foot volcanic plug. The 20-minute climb up goes past devout pilgrims, cheeky monkeys, and occasionally slow-stepping hermit monks called yeti.