An ossuary built in 1210 to collect bones from the Ospedale Maggiore of Milan.

Those who own or stay at this 500-year-old, allegedly cursed house often meet terrible fates.

A medieval weapon rumored to have been used by the brilliant poet himself.

Secret refuge and museum of the Duke of Florence.

Over 50 exquisite hand-painted Renaissance maps decorate a Medici storage room.

This private skyway is filled with art and was expanded explicitly so that Hitler could appreciate a river.

A city block packed with whimsical sculptures that seem to be plucked from a tiled fantasy world.

A series of playful yellow penguins share a serious message about the environment.

This charming wooden church was disassembled and moved not once but twice before settling in this Prague garden.

A bust of Franz Kafka spins in pieces, reflecting the writer's inner torment.

A Jenga-style cylindrical tower of books that appears to go on forever.

A fashion designer's dazzling world of Japanese collectibles is hidden in a warehouse downtown.

This collector's home is a constant work in progress.

The site of a classic series of Laurel and Hardy pratfalls.

The neighborhood shop is a sort of tiny cactus museum full of exotic specimens you can take home.

This ultra-modern home clings to the slope of the Hollywood Hills on a precarious stilt.

In a city filled with Frank Gehry buildings, one stands out as one of the architect's weirder works.

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

Rainbow-hued local gem in Venice.

America's most famous piece of self-built architecture.

Venue for strange sideshow displays and musical acts.

A beautiful art space and unusual mini-hotel hidden in the city center of Dnipro.

Get past the gatekeeper's apartment and enter an elaborate hoax of a restaurant with a Masonic feel.

Installed in an act of one-upsmanship, the annual sundial in this church is also a symbolic victory for the Gregorian calendar.