This legendary city has been a tourist attraction for centuries.

The hallucinogenic center of the ancient world.

The world's largest historic armory was established by independent citizens to defend themselves from the wars of larger forces.

Built to repay the sins of the father, this church is home to one of the most valuable works of Western art.

This Canary island is a quintessential example of nature’s beauty, and its unbridled fury.

An impressive display of ships and artifacts from the ancient Mediterranean maritime trade.

Partially collapsed lava tube and cave system complete with concert hall, underground pond, and unique albino crabs.

Natural stone arches form a walkable "cathedral" at low tide, then disappear entirely when the water returns.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

Natural history museum displaying a famous taxidermied St. Bernard.

The "Prussian Versailles" that is as glorious today as when it was built.

This German version of Universal Studios holds a vault of treasures from the NeverEnding Story.

World's largest permanent maze made of 18,000 conifers.

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

Video games, body language, and postal history are all on display in this Swiss museum.

These spooky and unusual stone formations create an underworldly landscape.

Caves famous for the dragon-slaying saint who lived there.

Hundreds of stone stairs and a winding medieval bridge connect this haunting Spanish island to the mainland.

Abandoned for decades, trains still pass through the now-restored remains of one of Madrid's first metro stations.

The world's largest neutrino telescope searches for secrets of the universe at the South Pole.

A magical place that lets you play in and explore the world of Studio Ghibli.

On Japan's Tashirojima Island, cats are king.

Both church and state get put to the torch in this annual festival in the "Bonfire Capital of the World."

Earth's tallest volcano is sacred to Native Hawaiians, and home to a dozen world-class observatories.