The best-preserved ancient theater in the world.

Roman ruins top white travertine terraces formed by ancient hot springs.

Seven early Christians were sealed into a cave where legend has it they slept unharmed for centuries.

Carvings in Turkey's Marble Road may have directed ancient Romans to a hidden brothel.

Ancient serpentine sacrifice holder that has stood the test of time.

This crucial gathering spot along the "hippie trail" still displays old notes between traveling beatniks and backpackers.

A small etching on the white marble parapet was written in runic script by a Viking mercenary.

Heralded as the world's first theater, these ruins are often overlooked as they reside in the shadows of the Acropolis.

A charming beach town in Turkey captures all the colors of the rainbow.

This secret coastal village is studded with pastel-colored houses all piled on top of one another.

According to local legends, the shallow sandbar that allows visitors to walk across Orhaniye Bay has a tragic backstory.

A unique seaside cave where Aleister Crowley faked his own death.

One man's remarkable private collection of art from around the world.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

This unique architectural wonder is also tied to one of the 20th-century's most renowned writers.

Hidden beneath a beautiful overlook you’ll find the history of the city depicted in comic strip format next to a pay toilet.

This once-forgotten oasis in the middle of Lisbon was first created over a century ago quite by accident.

Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

A gigantic, symbolic artwork covers the side of the building.

These subterranean models show Mexico City's central square during three different eras.

This giant expressionist head crowns a museum devoted to a beloved Mexican leader.

The unique collection often goes unnoticed by visitors focused only on the archaeological objects.

A jewel of the Mexico city skyline now slowly crumbles after surviving an earthquake.