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

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

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

2300-year-old Roman road connecting the empire.

This underground church is topped with a 500-foot cross that is seen by many as a beacon of fascist hubris.

One of the few remaining ancient aqueducts described by Frontinus as 'the most solemn testimony of the Empire.'

3,000 market stands in five former Zeppelin hangars.

A black cat protests the City Guild in Riga's Old Town.

Flamboyant architecture from the turn of 20th century.

Enormous statue of the Emperor of the Mongols.

Love, knishes, and best wishes from this legendary Lower East Side bakery.

Over two centuries old and counting, Madrid's massive botanical garden contains one of Europe's only desert environments.

An extraordinary collection of scientific instruments - and Einstein's chalkboard - inside the world's oldest purpose built museum building.