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

The possible imprisonment of Vlad the Impaler here earned the medieval castle its nickname, "Dracula's Castle."

This once-derelict building is now one of the most beautiful bookstores in the world.

Even drowned in an ocean of toxic waste, the remnants of this Romanian village stand tall.

The romantic botanic tunnel feels like a well-kept secret.

This fairy-tale castle would make Dracula (who is said to have been imprisoned there) jealous.

Moss and stone turn this waterfall into an otherworldly liquid veil.

A unique underground structure dating back to the 1st century BC.

Now a memorial, this factory was once used as a concentration camp for artists by the Vichy government.

Longest canal tunnel in the world, abandoned in the 1960s.

This elaborate hole in the ground was built as a sacred site for an ancient civilization.

Behemoth, cannon-like telescope operated by generations of Irish earls.

After being destroyed by IRA sympathizers, the ruins of this stately Irish manor have sat vacant for decades.

Obelisks and stone pineapples in the Irish countryside.

This floating garden in the sky is straight out of a fairy tale, but the real thing is nothing short of magical.

This Irish show cave is said to have been the site of a Viking massacre that claimed 1,000 lives.

Thirty creepy ghosts now inhabit this decaying 14th-century church.

A museum of alchemy and a basement laboratory all housed in an ancient building in a Gothic tower.

Macabre astrological automaton clock dating to the late 1400s.

This cemetery features modernist statues as strange as its name.

Week-long block party becomes a competition for the best decorated street.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

The fairy tale castle of the "fairy-tale king."