Boryeong Mud Festival (South Korea)

No other festival on this list transforms a beach town into a muddy battleground like the Boryeong Mud Festival, which draws 3 million visitors annually to a coastal town of just 100,000 residents. Originally a marketing campaign for mineral-rich mud cosmetics, this Korean phenomenon now features mud wrestling, mud slides, and a massive mud pool that stretches for blocks. The event's 4.2 million square feet of imported mud is sourced from Boryeong's tidal flats, known for trace minerals like germanium and bentonite.