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

The angel of death appears to weep black tears at this grave marker.

The second oldest continuously operating bar in Louisiana.

Each spring, a dreamlike carpet of bluebells overtakes the forest floor.

Roman ruins top white travertine terraces formed by ancient hot springs.

Bioluminescent firefly squid light up this Japanese fishing port.

Iceland's largest lagoon is home to stunning multi-colored icebergs.

An arsenic-filled pool in the Grand Canyon takes on the appearance of a giant, overflowing pumpkin.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

The bizarre visions of H.R. Giger, tucked away in a Swiss medieval city.

The installation’s official name, “You Who Are Getting Obliterated in the Dancing Swarm of Fireflies,” says it all.

Take a drunken tour inside the world's largest known geode.

Perfectly preserved ancient monastery in an impossibly dramatic location on a rocky island in the Atlantic.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

This volcanic cave lake is essentially hard proof that Iceland is the most magical place on Earth.

A lake with hundreds of ancient skeletons surrounding it. The surprise is what killed them.

A fifth-century temple improbably built into the side of a cliff.

An acoustic anomaly with a mysterious cause.

The world's longest known cave system.

The most alien-looking place on Earth.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

Tubing through a cave lit with glowworms is a magical underground experience.

Breathtakingly blue walls shimmer inside the "Glacier Behind the Town."