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

The only "Egyptian" pyramid in Europe and the legendary tomb of Remus.

A fairy tale castle in modern Rome.

An alchemist's "magic door" stands in the middle of a Roman park.

At the crypt of St. Mary of Eulogies and the Dead you are left alone to ponder mortality among piles of skulls.

A mysterious chasm in the heart of the ancient Roman Forum, the Lacus Curtius was once believed to be a gateway to hell.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

The yawning maw of this pagan visage is said to bite off the hands of liars.

This hill made entirely of ancient Roman jars was simply a garbage dump to the people of the time.

The skull of the patron saint of lovers lies in the Basilica di Santa Maria in Cosmedin—maybe.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

Architectural monsters are devouring this palace's every door and window.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

The famous sculptor left his mark on this Italian wall in an internationally protected example of street art.

The preserved house of a jazz legend still echoes with his music.

Hiroshima survivor on Riverside Drive.

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

Sniff the Titan Arum's rotting flesh.

A celebration of capitalism in Midtown.

Retribution for death of infamous mob boss Franie Yale was a case of mistaken identity.

Where infamous mobster and leader of Murder Inc. Albert Anastasia made his home.

A hip bar decorated with walls of golden skulls.

Walk over a 150 year old manhole.

A WWI fighter plane and turn-of-the-century penny candy shop are among the unexpected features of this Financial District building.