The final resting place of the poets Shelley and Keats.

The engineering wonder and pleasure dome of a much-maligned emperor still holds undiscovered secrets.

2300-year-old Roman road connecting the empire.

The only "Egyptian" pyramid in Europe and the legendary tomb of Remus.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

Rome's semi-secret peephole vista is also a former Crusader stronghold.

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

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

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

Museum preserving torture methods from the past.

This surreal statue brings a famous French novel about a supernatural cad to arresting life.

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

The remains of a century-old mansion that met a fiery demise years after it was deserted.

A ruined mansion hidden in the woods of the Hudson Valley, home of a tragically doomed romance.