This underground church is topped with a 500-foot cross that is seen by many as a beacon of fascist hubris.

A large collection of solar and night-time telescopes dot a small area on the Teide mountain range.

This unique rock formation is quite the local celebrity, although one day it may come crashing down.

According to the Guanches, the aboriginal people of the Canary Islands, the king of evil lives inside this volcano.

This local emblem is the oldest and largest dragon tree in the Canary Islands.

Long tunnels run under the ancient chariot racing circuit to the tower.

The prototype for all Nazi concentration camps.

Living towers made of people that are now recognized by UNESCO.

Holy Grotto of Montserrat Monastery holds one of Europe's mysterious black Madonnas.

Sanctuary on a ridge near an ancient shrine to a "Black Madonna" built by the founder of Opus Dei.

A Trabant car, a kangaroo statue, and a plethora of plants take over this abandoned-factory-turned-bar.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

A museum dedicated to a secret military hospital hidden beneath a castle in Budapest.

This memorial to a murdered empress took 20 years to design, then spent 30 years hidden away in storage.

An enormous and lavish Gothic church in Czechia.

A church of bones, decorated with 40,000 human skeletons.

Created as a "model concentration camp" to hide Nazi atrocities from the international community, this former camp-ghetto now holds a museum and memorial honoring the lives lost within.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

Synagogue built from the stones of Solomon's temple contains the golem of Prague.

Macabre astrological automaton clock dating to the late 1400s.

This spooky statue sits outside a famous Prague theater.

A turn of the century building boasting some of the most beautiful art nouveau architecture in Prague.

Throughout this shopping mall are medieval ruins that were discovered during the mall's construction.

A surreal statue honoring Prague's favorite literary son.