Located right outside of Vienna, visitors can take in expansive views of an ethereal forest.

Underwater art project will double as a massive artificial coral reef to help regenerate the damaged ecosystem.

In the land of the Light Brigade stands a testament to the Cold War.

Where the lovelorn find a home for their sentimental keepsakes.

One believer transformed a local curiosity into proof of Vikings on the Great Plains.

A five-story homage to tea times past.

This hospital fell into ruins after failing to act as the advocate for the mentally ill it was designed to be.

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

Museum dedicated to the UK's first charity for abandoned children, with keepsakes of the mothers who left them behind.

A grove of colossal man-made flowers built to collect the sun's rays.

Science fiction's grandfather has a fittingly marvelous tomb.

The tragic reality of a town riddled with rumors of haunts, chemical spills, and serial killers.

Europe's second largest ossuary wasn't discovered until 2001.

The haunting, dilapidated remains of a former poorhouse on Staten Island's Greenbelt.

A former Oz-themed attraction that has fallen into disrepair, but still holds some of the original magic.

A theme park made of glass, from the gleaming books on the shelves to the crystal fish in the mirror lake.

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

The resting place for anonymous victims of the Danube's dark waters.

A long abandoned hospital building on the outskirts of NYC.

A theme park attraction designed to turn your children into LARPers.