Hidden beneath the famous St. Peter's Basilica is a veritable city of the dead that may hold the remains of St. Peter himself.

Inside a former cabaret, seven floors of erotic art.

The celebrated eyesore created by starry-eyed sweethearts.

The history and future of cannabis.

Cozy basement bar sports an inventory of over 2,000 beers.

A little sculpture with a large wardrobe.

This former Roman Catholic Church still contains the embalmed hearts and organs of 22 popes.

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

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

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

Avoid gangster interaction while window-shopping.

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

Hear the quietest sound from across the dome.

An unusual round church in London with a Templar past.

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.