This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

Jesus' footprints and the first catacombs in the world.

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

A wunderkammer of gold and silver reliquaries and ancient saintly bones.

A collection of objects supposedly singed by the hands of souls in purgatory.

A dismembered holy head stares out from her beautiful reliquary at the St. Dominic Basilica.

Christ's blood preserved in a Belgian town.

Medieval museum built over Roman baths that features famous tapestries of a lady and a unicorn.

A church that bred legends, and served as an inspiration for the Da Vinci Code.

The beautiful baroque library of the Hapsburg empire.

Architecturally stunning library serves as the hub of Finnish scholarly life and culture.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

The bookstore with bookshelves built into unlikely places.

Machismo turned on its head: the lady's hand goes to the dude with the bigger brain.

This small chapel is built of human bones and decorated with a golden skeleton.

Small on the outside, big on the inside, this church is an astonishing act of visual deception.

Medieval torture techniques with a modern conscience.

Macabre headstones carved with winged skulls, dancing skeletons, and pithy reminders of impending death.