The roof of this ancient mausoleum is made from a single Istrian stone weighing a massive 230 tons.

Italian poet Dante Alighieri is entombed in this small mausoleum in Ravenna, and his hometown of Florence has never been too happy about it.

Filled with goldfish swimming in a shallow pool of sea water, this ancient crypt is more wishing well than burial site.

Psychoanalyst Carl Jung reported a paranormal experience after visiting this mosaic-lined Roman baptistry.

This 6th-century church has the largest and best-preserved collection of Byzantine mosaics outside Constantinople.

An incredible mosaic-lined monument said to have held the remains of an ancient Roman empress.

A galley-shaped memorial to the prisoners of an infamous fortress.

The ruins of this temple were later chosen by Pope Celestine V to found an abbey and a hermitage.

Striking fusion of Islamic and postmodern architecture, said to be the largest mosque in Western Europe.

This immaculately preserved church from late antiquity was originally the mausoleum of the Emperor Constantine's daughter.

Crispy, cheesy rice balls—the Roman answer to arancini—take center stage here.

Believed to be the remains of the lost Temple of Minerva, this nymphaeum has been known by its misnomer to this day.

One of Catholicism's four major basilicas has a series of papal portraits that are said to predict the end of the world.

A monumental fountain in Rome features a large statue of Moses that has been criticized for centuries.

The best preserved Paleochristian basilica in Rome hides a number of oddities and secrets.

Inside this McDonald's you can dine on your Big Mac and fries next to a 2,500-year-old Roman wall.

Yup, that's where the name came from.

Controversial tribute to the heavyweight champion boxer who grew up in Detroit.

The final resting place for the famed creator and narrator of "The Twilight Zone."

Despite its extensive history, this fort saw little to no combat.

True to its name, this bouncy walkway may be the world’s smallest suspension bridge.

Sip cherry liqueur at a bar dating back to 1840.

The bronze creation commemorates the life and work of a beloved actor.

The remains of a historic plantation nestled in between a parking lot and the rental car return at Reagan National Airport.