Elaborate tile work in this railway station tells the story of Portugal.

Ancient catacombs form the foundation for this Rococo orgy of a church.

The somber sculptures commemorating Irish Famine on the river Liffey in Dublin.

Commonly acknowledged as the only public monument to the Devil himself.

An ancient Egyptian temple in the middle of Madrid, Spain.

Climb inside an iron crystal magnified 165 billion times its normal size.

This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.

Museum dedicated to the terror regimes of Hungary.

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

Macabre astrological automaton clock dating to the late 1400s.

This Prague museum collects brutalist relics and memories from the country's former Soviet rule.

The Cathedral of Salamanca has a number of unusual carvings but none so surprising as a modern astronaut.

A beautifully eclectic mix of architectural styles.

The very center of Paris is surrounded by a bevy of strange good luck rituals.

The celebrated eyesore created by starry-eyed sweethearts.

19th century pendulum and a clock restored by a rogue group of guerilla artists.

The final resting place of soldiers' loyal canine companions.

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

A unique seaside cave where Aleister Crowley faked his own death.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

Picturesque intersection of witchcraft and ancient Christianity.

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.

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