Ancient human, animal, and geometric figures drawn in the earth.

Colorful Native American paintings are hidden within this small cavern.

A mountain range on an active U.S. Navy base hides thousands of mysterious prehistoric rock carvings.

This mesmerizing medieval monastery-cave complex sits thousands of feet above ground overlooking a valley.

No one knows how this Pacific Northwest spruce tree came to have so many trunks.

Enormous lake at the bottom of a unique cave system.

This head-spinningly bizarre Depression-era art cave is wall-to-wall quartz and Jesus.

This cave system allegedly holds the "metallic library" of a lost ancient civilization.

A legal loophole makes it possible to get away with murder within this 50-square-mile section of Yellowstone.

The world’s tallest outdoor lift stretches along the stone pillars that inspired the floating mountains in the movie “Avatar.”

Deep below the dry landscape of Bahia, a cave with intense blue water to float in.

An abandoned railroad tunnel is now filled with bioluminescent bugs.

The only thing sweeter than the potatoes is the canine proprietor of this roadside stall.

The eerie remnants of an ancient forest were hidden under the sand for centuries.

An immersive environment that is part haunted house, part choose-your-own-adventure, and part jungle gym.

Nestled in an unassuming residential area, this "forbidden forest" is rumored to spirit away those who dare to enter.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

Across Ring Mountain is a vast collection of Native American petroglyphs unique to the region.

An architect transformed this abandoned cement factory into his castle-like workshop.

A giant Troll lurks under one of Seattle's oldest bridges.

Two ancient Buddhist temples crown this dramatic rocky pinnacle.

Isolated atop this Balinese sea crag is a lovely Hindu temple that is said to be guarded by sea snakes.

Life in this isolated, hilltop lighthouse was lonely, but it sure was lovely.

Named for the DeFoe novel inspired by a stranded sailor, this island is known for its rare plants and extreme beauty.