Collapsing castle on the Hudson river was once the storage site of military surplus business.

An elaborate gift from Claus Spreckels is now a piece of San Francisco history.

World Trade Center memorial likened to a woman's sexual organ.

The world’s first penitentiary, meant to be humane, drove men insane.

Vacant Beaux-Arts buildings that serve as reminders of a beach town’s glory days.

Adherence to strict Jewish laws is required to enter this ultra-conservative New York village.

The key to turning shifting dunes into the green oasis of Golden Gate Park.

This immaculate and historic water garden culminates in a massive stone dining table with an inset fountain for chilling the wine of the Cardinal's guests.

How did a French journalist’s grave become the sexiest statue in the cemetery?

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

Cuba's historical trains remind natives of their country's sugary sweet past.

An unusual round church in London with a Templar past.

An artist's cute bronze subway sculptures belie his violent artistic past.

A semi-scholarly approach to sex.

The New York hotel where tragic visionary Nikola Tesla spent his final hours, destitute and alone but for the pigeons.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

The remnants of two World's Fairs are here, complete with a 12-story globe, a mini-Manhattan, and a UFO-shaped pavilion.

A celebration of capitalism in Midtown.

Curious crustaceans support an obelisk from ancient Egypt that now stands in modern-day Central Park.

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

A curious fountain that has no water and includes Satan, a crab, and 9 giraffes.

Visit the monolithic tomb of America's most famous general.

Mysterious 500-year-old tapestries depict a unicorn hunt.

A whimsical monument deep in this park commemorates the groups that helped build it.