This abandoned Slovenian military barracks has become a punky-political art squat.

Castle and secret tunnel withstood a siege until its owner was killed by the Holy Roman Empire, while sitting on the toilet.

Artist Danielle Jacqui decorates nearly every inch of her home inside and out with her work.

Next to the Leaning Tower of Pisa is a cemetery home to ancient sarcophagi and disturbing murals.

A local student's chance encounter with Keith Haring led to the creation of one of Europe's largest murals.

An extraordinary house museum and cabinet of curiosities in the heart of Florence.

The former home of an Italian artist is now a shrine to his ambitious works.

A huge enchanting public park just outside the ancient walls of Rome.

A modern sliver of architecture in Roma.

The engineering wonder and pleasure dome of a much-maligned emperor still holds undiscovered secrets.

One of the oldest producers of hand-folded fortune cookies still uses its original secret recipe.

A free, public museum dedicated to the fascinating science of sight.

A still functioning vaudeville carousel that has operated for over a century boasts a colorful menagerie and past.

Nestled in the heart of San Francisco’s bustling Financial District stands a unique homage to the Mayan and Beaux Arts.

A shop full of natural curiosities, carnivorous plants, and costumed taxidermied mice.

A collection of 20th-century automata, penny arcade games, and musical contraptions.

A beautiful collection of taxidermy birds and rare pomological wax models.

This historic toy museum brings a little whimsy to a city not usually remembered for such things.

Shimmering sea-colored mosaics and Jesus statues cover this opulent building.

A subterranean display of public art and architecture.

The prototype for all Nazi concentration camps.

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

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

One of the most easily accessible examples of the rare 1960s UFO houses.