A nightmare for the claustrophobic lies hidden in Southeast Asia.

This grand hydraulic installation has provided water for townspeople since the Middle Ages.

Founded in 670, this ancient mosque is an architectural time portal.

An ancient Phoenician citadel once stood at the site where Queen Dido first landed, according to legend.

An ancient burial ground believed to have been used for ritual sacrifice.

Some believe this abandoned Brutalist masterpiece inspired George Lucas's Sandcrawler.

The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

A favorite Paris bar for U.S. expats, including Gershwin, Hemingway, and James Bond.

This Parisian gem is one of the most incredible ethnographic museums in the world.

One of Jeff Koons’s largest sculptures and his first commemorative work.

Fortified medieval tower house with lovely roof garden.

This bustling Italian plaza is built on the ruins of an ancient Roman amphitheater.

A local student's chance encounter with Keith Haring led to the creation of one of Europe's largest murals.

The only visible reminders of an elaborate engineering project that kept the tower from reaching the tipping point.

Next to the Leaning Tower of Pisa is a cemetery home to ancient sarcophagi and disturbing murals.

The graveyard is filled with beautiful funerary art and boasts breathtaking views of Florence.

A copy of the famous statue can be found in this Florence piazza, along with one of the most breathtaking views of the city below.

Art and armour fill every inch of this rich kid's Italian villa.

Renaissance hospital featuring a rotating door into which unwanted babies were dropped.

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

This is the oldest Roman-made bridge in the city still existing in its original state.

A huge enchanting public park just outside the ancient walls of Rome.

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.