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

The final resting place of the poets Shelley and Keats.

The underground sanctuary of a mysterious ancient cult.

This hidden Art Nouveau courtyard is an opulent feast for the eyes.

What appears to be an ancient Roman temple is actually a Catholic church.

The little-known second castle that William the Conqueror built in York.

Eighteen mummies have stood guard behind the altar of this tiny church since 1833.