Conspiracy theories and occult legends surround this mysterious natural rock formation.

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

This eccentric folly house was designed by Romanian thinker Bogdan-Petriceicu Hasdeu, with a helping hand from his deceased daughter's spirit.

An unlikely neo-Gothic castle in the Paraguayan countryside.

A cemetery in Barcelona's Poblenou district is home to this touching funerary statue, which depicts death in the form of a winged skeleton.

There are no bodies inside these stone coffins. And there never were.

Regency-era excess on the English Coast.

Decrepit Victorian public lift is a white-knuckle ride.

Portugal’s highest lighthouse has one of the most impressive focal planes in the world.

This glass skywalk offers vertiginous views down the volcanic cliffs to the beach below.

These small, triangular, colorful houses are a staple of Madeira Island.

A lush oasis full of vibrant plants and striking geometric displays.

A micronation on an islet along the coast of a Portuguese island.

Crafted from ocean litter, this sculpture highlights the ills of overconsumption.

Every autumn, this grove of living fossils erupts in a blaze of brilliant golden-yellow leaves and stinky fruit.

An often overlooked ancient site in downtown Athens with substantial history (and nature).

The ruins of an ancient mansion sits in front of and underneath a contemporary art gallery.

The oldest cemetery of modern-day Athens blends the modern and ancient worlds.

Gladiators once walked this ancient, subterranean passage.

A sprawling collection of books and manuscripts about ancient Greece that would have put their famed libraries to shame.

The ruined doorway is a portal to the building's turbulent and torturous past.

An ancient octagonal weather station named for the eight Greek gods of wind.

This historic structure has been used as a mosque, a barracks, a prison, a school, and a bakery.

Legend says it was constructed with the destroyed pillar of an ancient Greek Temple.