A sculpture serving as an homage to Pope John Paul II.

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

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

Harlequin costumes, signed scripts, and armor-wearing puppets.

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

The tomb of one of Scotland's bloody historic villains is a magnet for bumbling desecrators.

Protecting the dead from opportunistic body snatchers.

This strange bovine gargoyle is said to have been put in as a passive aggressive form of revenge.

Secret refuge and museum of the Duke of Florence.

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

The very center of Paris is surrounded by a bevy of strange good luck rituals.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

The most loyal of little dogs, or a Victorian era publicity stunt?

These stark white cliffs were spat up by the sea and are slowly being retaken by it.

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.

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

Hear the quietest sound from across the dome.

Scattered throughout London are ancient remnants of the city's former bounding wall.

The perfectly preserved underground rooms where Churchill plotted the war against Germany.

London's smallest police station is barely the size of a phone booth.

In the heart of Brigham Young's promised land sits a festering plot of industrial ruin that has been claimed by society's outcasts.

A small section of Boise, Idaho maintains the unique culture and traditions of the Basque people.

All that's left of the quintessential "cabin in the woods."

An elaborate Mayan city shrouded in alien conspiracy revealed the tomb of Pacal the Great.