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

One of several skulls claiming to belong to the beheaded St. John the Baptist is on display at this Roman church.

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

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 mountaintop inspiration for Umberto Eco's "The Name of the Rose."

A fake medieval village in the middle of Turin.

The wreckage of a tragic plane crash is on display at this museum devoted to a famous Italian conspiracy.

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

This quaint Italian town keeps losing ground as the sides of its plateau slowly erode.

This 16th-century monastery has been turned into a surrealist architecture compound.

Renaissance villa and gardens complete with a tormented colossus.

Massive galleon from a box-office bomb docked in Genoa.

The bizarre visions of H.R. Giger, tucked away in a Swiss medieval city.

This historic covered bridge contains a series of macabre paintings that communicate one thing: everyone dies.

This memorial commemorating fallen Swiss Guards of the French Revolution has been called the saddest stone in the world.

These stairs were built to accommodate royals mounted on elephants.

A 17th-century mosque that was used for war more than worship.

One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.

Yo, Adrian!

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

One of the world's tallest Ferris wheels takes visitors high above Las Vegas in a spinning party room.

Frida Kahlo's childhood home, now a museum of her life and works.