A church filled with the bones of hundreds of virgins martyrs—or so they say.

"The most colorful grottoes of the world.

This "floating railway" is one of the world's oldest monorail systems.

A surreal museum of extraordinary industrial objects.

This old wooden funicular railway leads to a cemetery in the forest.

The final resting place of one of the first alleged vampires.

A sinuous path among steep cliffs creates a stunning sight in southwestern Serbia.

An old asylum graveyard that's been abandoned for half a century attracts those seeking a dark thrill.

Ruins of a 10th century church tucked away deep in a botanical garden.

A small statue commemorates a centuries-old event that still hangs over the people of Leuven.

This abandoned mansion has a window for every day of the year, and is a temple for ghost hunters.

Open air sculptures by an eccentric and loin-clothed hermit.

A New York–based physician returned home to Spain to build his own elaborate monument to Christopher Columbus.

The cathedral of a controversial, conservative, schismatic sect that declared the Catholic Church heretical and founded its own succession of popes.

These striking ruins of a castle resemble a ship's stern.

The remains of the second-oldest zoo in Europe can be seen within these library gardens.

Devastated landscape used for hundreds of years by the Romans as their primary mining site.

A Franco-era dam flooded (almost) everyone out of this centuries-old Aragonese town.

The oldest restaurant in the world is this old-world Spanish eatery, still known for its suckling pig.

This Arab fortress was once the largest citadel in Western Europe.

A whimsical garden of outsider art in the Spanish countryside.

Geological storytelling.

12th-century holy complex shares land with a natural park full of heavenly waterfalls and raptors.

This beautifully verdant lagoon is tucked below a massive volcano in a crater atop a black pebble beach.