Once a giant gingerbread factory, this space now hosts exhibits and workshops on the historic treat.

A huge wooden clock that is so beautiful its creator was forcibly blinded.

Crosses of all shapes, sizes and colors litter the mountain, the site of a huge yearly Orthodox pilgrimage.

This Polish cave has housed a dragon, a brothel, and an enduring legend.

Naturally formed rock city in Poland.

The site of the first battle of World War II.

A fairytale Gothic castle steeped in Nazi treasure conspiracy theories.

An underground city of salt.

The walls and ceiling of this Polish church are decorated with thousands of skulls, with another 21,000 skeletons just below.

Beneath Kraków Old Town's main square lies a hologram-filled medieval market vampire graveyard wonderland.

Countless stories attempt to explain Poland's mysterious J-shaped trees.

Ancient rock-hewn town that witnessed key events of Georgian history.

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

A cave dwelling that was started by the Celts, expanded by monks, and finished by knights.

Fur-lined metal pod dangling in the French countryside.

Natural mummies hidden in the crypt of a medieval French church.

This spectacular dome managed to survive after being bombed in World War II, in an event known as the "Miracle of Mosta."

The Jesus tree of Malta bears a striking resemblance to Christ on the cross.

A hidden tunnel of bones in one of Malta's oldest churches.

This prison on the Maltese island of Gozo is almost 500 years old, and they have the graffiti to prove it.

Stone Age solar temple is aligned with the sun on each equinox and solstice.

An abandoned set from the 1980 film "Popeye," claimed and repurposed as a theme park by creative locals.

One of Catholicism's four major basilicas has a series of papal portraits that are said to predict the end of the world.

2300-year-old Roman road connecting the empire.