Italian poet Dante Alighieri is entombed in this small mausoleum in Ravenna, and his hometown of Florence has never been too happy about it.

If a glacial river suddenly diving into a sheer chasm via a dramatic, multi-stage waterfall isn't peak Iceland, it's certainly close.

The unique waterfall in Iceland's south features a backdrop of geometric black lava columns.

Medicinal spa created with the discharge from a geothermal energy plant.

The oldest private art gallery in all of Hungary.

Sitting beneath an unremarkable residential building is a museum devoted to classic Pinball.

A fake Transylvanian castle houses a cathedral of antlers.

Late at night, the bust of the "Dracula" actor was snuck onto the facade of this Budapest castle.

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

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.

An eccentric collection of antique items shares space with a prop-quality witchcraft museum.

Moorish signal station on a stratgic rocky outcrop.

One of the most spectacular bridges in Spain spans a narrow chasm that divides the city of Ronda.

Three bridges and one giant canyon make up this fantastic Spanish settlement.

Spain's unique Mosque-Cathedral has been a place of worship for both Muslims and Christians throughout its history.

A curious carving hides on a marble column in the Mosque-Cathedral of Córdoba.

The world's largest wooden structure.

This former charity hospital for elderly clergy houses some of Seville’s most treasured paintings.

A 16th-century Andalusian palace.

Spanish architects used seized Muslim gravestones to rebuild parts of the fortress.

A museum dedicated to the Spanish occult in a town that was terrorized by the Inquisition.

Swarovski's museum/theme park is a fake diamond fantasia overlooked by a giant.

Hidden away in a modern library are the remains of one of the 18th century's most celebrated wunderkammers.