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

In Rome’s Jewish ghetto, a 200-year-old bakery still makes the neighborhood’s historic sweets.

An alchemist's "magic door" stands in the middle of a Roman park.

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

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

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

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."

These hut foundations are believed to be the residence of Romulus, founder of Rome.

This small Roman arch was transformed into a dwelling by the founder of the Trinitarian Order.

A fortified medieval basilica on the Caelian Hill preserves extraordinary frescoes and one of Rome's most beautiful hidden cloisters.

An ancient Roman temple first dedicated to an emperor's wife is now a church.

This subterranean shrine beneath a bike rental store celebrates the iconic Italian scooter.

A Nesting Doll of Churches.

The ruins of the largest gladiatorial school in Rome are largely hidden under modern streets.

This small museum is basically a time capsule of daily life in the Soviet Union.

One of the largest collections of socialist realist art shows the surprising depth of the official art of the Soviet Union.

This massive monument honors the first human in space.

One of the world's tallest statues is also one of its most hated.

A 360 degree battlefield experience.

Home of the future Emperors of Russia.

Stalinist skyscraper built with help of cryotechnology.

Dozens of padlock-trees along the Moscow River.

The avant-garde design was able to bypass strict Soviet regulations on architecture.