Ride a boat through this magnificent underground world, which now doubles as a theater.

Every year, the town of Menton, France, turns lemons and oranges into giant sculptures depicting windmills, dragons, and more.

Mother Nature outdoes herself with this stunningly beautiful set of caves carved into marble.

The famed amusement district marks the beginning of summer with a wild procession of nautical creatures.

A "Titanic" superfan changed his name to Jack and set up this strange shrine to the blockbuster, complete with Korean food and Tarot readings.

Deadly scalding and one of the largest hot springs in the world.

On the shores of Kyrgyzstan's Issyk-Kul Lake, a family cooks a feast that tells the sad tale of a people's exile.

An outstanding piece of retro Sci-Fi architecture built into a sacred mountain.

Largest private bird collection in Iceland, formed from a tragic accident.

These enlarged egg sculptures represent the native birds of eastern Iceland.

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

This nine-story building can be played like an instrument.

Perhaps the most spectacular grotto along the Algarve coastline.

One of the world's oldest and most massive living organisms is a grove of quaking aspens.

The largest wooden building in the world now houses a fascinating collection of aircraft.

Incredible miniature towns and buildings created and decorated with thousands of tiny rocks.

A six-foot pair of socks hangs from a drawer of the world's largest bureau.

Just a man taking his prehistoric pet for a stroll.

Over 50 historic windmills whir away at this outdoor museum.

This volcano rises like a giant anthill from the plains below, with a road spiraling up to the rim.

This natural marble cave is one of only five national monuments in Oregon.

The oldest residential street in Europe also features an optical illusion.

Large, airy hallways hide within an impenetrable fortress that beckons urban explorers.

A wonderfully strange collection of 500+ stuffed frogs doing people things.