This scale model of our solar system hid in plain sight for years before a physics team sought out all the planets.

A cluster of headless, armless sculptures looms within a popular Polish park.

These mechanical goats first battled it out in the year 1551, all because of an overcooked deer.

One of the largest amphitheaters in Europe is a former Nazi gathering place that still stands today.

While the U.S. and Soviet Union were engaged in a space race, Poland built a UFO on the ground.

The former Nazi concentration camp stands as a museum to remember this dark chapter in European history.

A collection of old neon signs from all over Poland line a secluded courtyard.

Obelisks and stone pineapples in the Irish countryside.

A corkscrew-shaped barn in Ireland.

Ukraine's oldest operating pharmacy now offers guests a fascinating walk through apothecary history.

The largest catacomb system in the world.

Featured in one of the most iconic scenes in cinema history.

Padlocks cover this rickety footbridge with love.

A castle perched precariously over the Crimean Sea.

This 18th-century fort surrounded by a moat was used to store gun powder and ammunition, and now sits in the middle of a large part in Dublin.

The mummified heart of a saint lives on in this church—after a brief hiatus when it was stolen.