Here, at the "world's longest art gallery," you'll find forty miles of ancient petroglyphs and pictographs.

At the right time of day, sunlight floods through the roof of this cave and illuminates the small pavilion hidden within.

Tucked along a river are enigmatic stone carvings created thousands of years ago.

An ancient system of freshwater caves filled with animal bones, including that of species long-extinct.

The winter home of millions of migrating monarch butterflies.

Extraordinary sculpture garden created by an eccentric English poet.

A gargantuan crystal kingdom.

Underwater art project will double as a massive artificial coral reef to help regenerate the damaged ecosystem.

"I did this all while you were watching TV."

Eat like pre-Columbian Native Americans in this New Mexico restaurant within the Indian Pueblo Cultural Center.

These subterranean storage areas hold emergency water reserves.

The restored and active Victorian-era final resting place of San Francisco.

Bring your own cardboard to the slippery slopes of concrete hidden in a neighborhood park.

A psychedelic labyrinth on the San Francisco bay.

A huge musical instrument played by the ocean.

An artsy hidden staircase leads to breathtaking views of San Francisco.

A solitary tree has grown up all alone on Lake Wānaka, backdropped by the beautiful Southern Alps.