This elaborately decorated, fairytale-like Romanian royal palace is one of the most striking castles in Europe.

This solitary monastery may hold the remains of Vlad the Impaler (but probably not).

The legendary cliffside castle of three-time Voivode of Wallachia, Vlad the Impaler.

This small chapel is built of human bones and decorated with a golden skeleton.

Macabre astrological automaton clock dating to the late 1400s.

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

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

After this one-of-a-kind palace was built the architect's hands are said to have been cut off to keep it that way.

The largest hewn stone in history.

Marked by the hand of the explorer Henry Morton Stanley.

Named after a legendary garden called Eram in southern Arabia, built by order of Shaddad, an Arab king who wanted to compete with Paradise.

17th century mosque for Shah Abbas' harem.

Putrefaction plateaus in Iran, where the dead were sent for decontamination before going to their final resting place.

The palace of the King of Kings, burned by Alexander the Great.

Mortarless walls that stretch for miles are a lovely solution for creating grazing land in the harsh terrain of the Aran Islands.

A hugely vast Irish landscape of barren rock that stretches for miles.

This controversial Irish show cave is home to a massive formation known as the Great Stalactite.

The largest Buddhist city in Europe is a haven for chess fanatics.

Gargantuan home of Russian science.

Stalinist skyscraper built with help of cryotechnology.

A small part of Russia that does not touch any other part of Russia.

World's largest bell sits on the grounds of the Kremlin in Moscow.

This building holds the embalmed remains of the leader of the Bolshevik Revolution.

An ancient necropolis of magnificent tombs.