A school teacher's massive and terrifying self-built castle.

La Monte Young and Marian Zazeela's "Dream House" will immerse you in an ever changing world of sound and light.

A popular European tradition makes its way to the states on one of America's most famous bridges.

Danish tourist destination well known for open stalls where vendors sell marijuana on the street.

This fantastical waterfall is hidden in a cave located in a cracked cliff.

These crumbling Nazi artillery bunkers are now fair game for massive graffiti projects.

The vast chamber inside this abandoned cooling tower looks like something out of a sci-fi dystopia.

According to the local folklore, the myriad colors of this lake are the result of a lovelorn wizard's blunder.

Pilgrimage site for star-crossed lovers.

This giant middle finger statue sends an unambiguous message to Italy's bankers.

A Gothic cathedral created from volcanic rocks.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

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

This quaint Spanish village agreed to be painted blue as a marketing stunt but found that they preferred it that way.

The heads of two giant mythological water horses honor Scotland's horselord past.

This French ghost town from World War II has been left as a memorial to German atrocities during World War II.

This castle was established by the 4th Duke of Montrose and is connected to the Buchanan Clan.

One of Scotland's most important modern structures, it just made the '100 Most Endangered Sites' list.

Three columns of volcanic rock shoot out of the ocean.

This stunning concert hall has become a symbol of Iceland's national recovery.

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

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

Twisted girders are all that remain of an Icelandic bridge that was wiped out by a combination of volcanic heat and glacial floods.

Rising from the sea like a stone monster.