Sweden's first nuclear reactor, R1, can be visited 25 meters underground.

One man's hand-sculpted collection of colorful masks representing a host of gruesome spirits.

This attraction is part anthropological journey and part amusement park.

This Taiwanese promontory is covered in otherworldly hoodoo formations.

Amazing and mysterious Neolithic settlement on Scotland's Orkney Islands.

This dramatic landscape hidden on the Isle of Skye looks as though you've stepped into the magical realm.

Ruined 11th century abbey built by King David I in Edinburgh, Scotland.

A memorial to the thousands of Turkmen soldiers and civilians who died in a bloody 1881 battle.

Sumptous memorial to a controversial independence.

A dictator's gold statue once rotated to face the sun on a 75-meter high marble tower.

This harsh mountain path was built as a strange attempt to improve the health of Turkmen citizens.

An eccentric dictator's take on a Turkmen version of Disneyland.

A cave covered with bizarre stalactites of cloth.

If you want to get married in the White Marble City of Ashgabat, you should do it in this surreal disco ball building.

The lake that fills and empties itself at random.

This gnarled old tree supposedly sprouted from seeds kept in the pocket of a 16th-century Spanish sailor.

Northern Ireland's Brobdingnagian stepping stones.

The mystery of the Putim Ossuary involves a tricorn hat.

A controversial artwork draws attention to the dark history of Prague's "Suicide Bridge."

A former squatter's paradise outside Prague.

A sculpture of the iconic East German car on four legs is a tribute to those who traveled to Prague seeking asylum.

This walkway is so narrow it needs its own light to stop pedestrian traffic jams.

Looming communist pillar with a Czech twist.

The world's greatest slide descends 18 stories from this looping mountaintop viewing platform.