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

A Nesting Doll of Churches.

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

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

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

The mortal remains of an estimated 70,000 people lie in the basement of a monastery in Lima, Peru.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.