The world's brightest bioluminescent bay.

A rocky sea serpent hides caves, blowholes, and a spectacular natural bridge.

Collapsing castle on the Hudson river was once the storage site of military surplus business.

A newspaper editor turned this abandoned island into a tortoise nature preserve that's now the world's smallest national park.

The red crab exhibits one of the most spectacular migrations on earth, despite manmade obstacles.

An abandoned whaling station on an active volcano offers hot springs in Antarctica, surrounded by ruined giants of industry.

The largest stone moai on Rapa Nui.

This one-time health resort was used by aristocrats around the world.

An island filled with hundreds of hanging, decomposing, decapitated dolls.

A petite white lighthouse perched on the ancient core of Stromboli Volcano.

An abandoned settlement originally established by British colonialists in the Andaman archipelago.

These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world's largest coastal brick fortresses.

Bermuda triangle lighthouse, site of mysterious disappearances, left to crumble into the Atlantic.

The Uros people live on floating reed islands in lake Titicaca.

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

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

The most alien-looking place on Earth.

This dramatic sea spire is home to the world's rarest insect and is part of the lost continent of Zealandia.

A volcanic old faithful, Stromboli has been erupting continuously for the last 2000 years.

This small primate research island is teeming with playing, fighting wild monkeys.

A tiny islet just off Long Island offers a wealth of infectious curiosities.

An ethereal glowing blue ocean cave in Croatia.

Submerged trees jut ghost-like out of an idyllic turquoise mountain lake.

Remote Honduran Islands with a colorful history.