The lesser-known Alice sculpture of Central Park dedicated to the “godmother of American children.”

A playground the size of a city block is a modernist monument to civic values and public housing.

Once considered the height of medical modernity, this structure is now the oldest remaining component of Roosevelt Hospital.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

The mysterious image is believed to show Edward Hyde, 3rd Earl of Clarendon, in a beautiful blue dress.

This impressive scene portrays the elusive forest giraffe of Central Africa.

One of the most dazzling dioramas at the American Museum of Natural History is also one of the oldest.

A controversial magical figure is hidden within a diorama of the city.

The name of this tiny pocket park tucked between two buildings on Manhattan's Upper West Side is Latin for its location: "seventy-one."

This nostalgic blast from the grooming past is also a working barbershop.

You can take a class, browse the library, or visit the lavish lair of an international men's humor society.

A strange and haunting monument of unknown origin in the historic Graceland Cemetery.

A small triangle of DC grass is the final resting place of one of Sonny and Cher's songs.

Obscure Freemasons still live in D.C.’s largest private residence.

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

This spooky statue sits outside a famous Prague theater.

A turn of the century building boasting some of the most beautiful art nouveau architecture in Prague.

Buried five stories underground, this Soviet bunker is packed with gas masks and Cold War paraphernalia.

Macabre astrological automaton clock dating to the late 1400s.

Sid Vicious famously punched a hole in the wall of this iconic music venue.

The history of occult science is turned into a creepshow at this lurid Prague tourist attraction.

A plaque marks the spot where the saint was shoved off the Charles Bridge and into the river.

A giant interactive periodic table with real samples of the elements.

Tucked away in a Prague park, a statue beloved by romantics honors a poet so nice they buried him twice.