Step inside the first house designed by Catalan architect Antoni Gaudí, considered to be one of the first Art Nouveau buildings.

A Cold War command center is hidden under an idyllic countryside.

Abandoned since 1998, this train station has become an oasis for urban explorers.

A fascinating and enormous collection of natural history exhibits stained by a dark colonial legacy.

One of Belgium's oldest hospitals saw patients from the 13th to 20th centuries before becoming a museum.

A collection of weird and wonderful art fills a former houseplant nursery.

These Finnish rapids have been attracting tourists for over a hundred years and are now released with the push of a button.

This Danish rock field is actually a sprawling ancient cemetery holding the bodies of 700 Vikings.

Iron Age "bog person" preserved for over 2,300 years.

A natural wonder in south Denmark.

A walkable map of the world, made from soil and stone by one man.

A somber memorial at the site where hundreds of prisoners and civilians were executed in the aftermath of World War II.

This graffitied 19th-century building was a prototype of European industrial architecture.

The abandoned summer estate of the former Greek Royal Family.

A little-known park with unusual, half-ruined structures and a mystical energy.

This wrecked ghost ship has been rusting on a Greek beach since the 1980s.

According to myth, Zeus himself was hidden in this cave to escape being eaten by his dad.

This now abandoned restaurant provides some of the most amazing views of Lisboa.

An exquisite collection of fairytale conveyances that puts most car museums to shame.

The corpse bride of Portugal.

Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.

A 16th century chapel decorated with bones, skulls, and entire bodies hanging from the wall.

This one-room museum is dedicated to Norwegian history and jokes.

Once the scene of a young boy's home in revolt, this Norwegian island is now home to the world's first "ecological" prison.