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

2300-year-old Roman road connecting the empire.

The final resting place of the poets Shelley and Keats.

Architectural monsters are devouring this palace's every door and window.

The once forbidden "secret cabinet" of erotic art from excavations of Pompeii and Herculaneum.

A small island less than half a mile from Venice is a forbidden island with a dark and twisted past.

At the crypt of St. Mary of Eulogies and the Dead you are left alone to ponder mortality among piles of skulls.

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

The glowing blue Nymphaeum of Emperor Tiberius.

A 16th-century horror show built in a lovely Italian garden.

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

In a city that boasts four separate inclined cable railways, this is one of the busiest funicular lines in the world.

Architectureal fantasy quarter of Rome.

Pompeii's less famous neighbor is still revealing her secrets.

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