The romantic garden was the epicenter of the Hungarian art scene in the 1880s.

Once the home of a hermetic monk, this cave now houses a small church.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.

A 19th century artistocrat's mansion, turned into a library, hidden in a modern library.

This igneous rock monolith towers above the surrounding landscape just outside the Nigerian capital.

A deserted medieval village where bodies were once mutilated to prevent them rising from the dead.

Copenhagen's celebrated theme park and gardens.

A quiet, gothic haven nestled between Pittsburgh's Squirrel Hill and Point Breeze neighborhoods.

An abandoned church gets a second life as a massive beer hall and event space.

House of vintage taxidermy and Steampunk sculptures in a quiet Pittsburgh neighborhood.

Abandoned mini-mansions that were once intended for affluent Bangkok families now sit empty.

Vintage furniture and art share space with all manner of collectibles at this quirky shop in Bangkok.

The final resting place of 121 victims of the RMS Titanic, 42 of which may never be identified.

Nature and art meet in this curvy creation

A hidden network of subterranean passageways lies tangled beneath Indianapolis' bustling City Market.

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

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

The world's only museum devoted to the wonders of fluorescence.

Inside the simple black-and-white exterior of Église Sainte-Cécile hides a pastel wonderland.

An abandoned 1970s theme park that has been turned into a space for waterfront walking.

The graveyard is filled with beautiful funerary art and boasts breathtaking views of Florence.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

France's most famous cemetery, with some of its most curious tombs.