Architectureal fantasy quarter of Rome.

Rome's semi-secret peephole vista is also a former Crusader stronghold.

There is a strange little carving of a person seemingly crushed by a pillar behind the remains of St. Thomas Aquinas.

Jean Tinguely's bizarre monster sculpture is hidden deep in a forest.

Walk upon the mementos of the dead in this Parisian courtyard paved with medieval tombstones.

A museum dedicated to one of Paris’s most famous residents, tucked into a corner of one of the city’s most famous squares.

19th century pendulum and a clock restored by a rogue group of guerilla artists.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

Eco-village hidden in the foothills of the Alps that created a massive system of psychedelic underground temples.

A curious collection of locks and keys.

This former lieutenant governor's home is brimming with curiosities.

Pay your respects to a folk-punk legend.

Where the line between entertainment and aerospace blurs.

A ghost town at the airport is now a refuge for blue butterflies.

This iconic L.A. bookshop is housed in an abandoned bank—both symbolic and chic.

Art from the latest counter-culture; kids who dye their hair blue and believe the future will be a post-apocalyptic water world.

Three small rooms at the back of the “official” church of London's clowns.

This hidden rooftop garden in downtown London offers a quiet respite from a bustling city.

The home studio one of Britain's first independent record producers is also the site of a murder-suicide.

Lyon's miniature version of the Eiffel Tower was built as a statement in support of French secularism.

An enchanting work of outsider art, full of whimsical sculptures and carvings.

Egyptian Revival movie palace abandoned for decades and restored in 2013.

A surrealist timepiece by the artist of melting clocks.

This modern museum of Mediterranean culture is surrounded by a surreal concrete honeycomb.