This curious, round temple is the oldest still-standing marble building in Rome.

This ancient market is often referred to as the oldest shopping mall in the world.

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

The "Great Sewer" of ancient Rome is one of the oldest sewer systems in the world, and is still in use.

This large, circular tomb is the final resting place of the first emperor of Rome.

The spot where the fascist dictator made some of his most famous speeches including declaring war on Britain and France.

This former Roman Catholic Church still contains the embalmed hearts and organs of 22 popes.

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

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

The skull of the patron saint of lovers lies in the Basilica di Santa Maria in Cosmedin—maybe.

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

Rome’s legendary peephole vista is also a former Crusader stronghold.

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."

A basement pool hall is the front for some of the best Dominican food in New York City.

An ancient Egyptian obelisk is now used to commemorate fallen Italian soldiers.

This historic Chinese church was relocated and revived as a museum that preserves and celebrates Chinese art, history, and culture.

The Yiddish language stages a renaissance in a shtetl-inspired cultural center on the San Diego coast.

The oldest standing structure in downtown San Diego.

A monument to a one-legged kidnapper, horse thief, and charlatan asks visitors to throw rocks in a pile.

Huge otherworldly domed rocks on the shore of a deadly lake.

At this deceptively beautiful beach, nothing is what it seems.

Erroneously called the world's tallest flagpole, this landmark is devoted to "good neighborliness."