Every three years in Japan an exciting event kicks off—one that invites visitors to enjoy the great outdoors while simultaneously exploring the largest art gallery in the world.

For 50 days, visitors to the Echigo-Tsumari Art Triennale traverse 200 villages across roughly 770 square kilometers (190,000 acres) of mountainous terrain located in Niigata, Japan. The entire land is dotted with site-specific artworks created by 160 artists from all over the world, making it the largest, most ambitious art festival in the world. And each piece is united by a single theme: humans are part of nature.