This unassuming passageway played a key role in one of the most important events in U.S. history.

This column celebrates Rome's victory over the Goths, and may be the oldest Roman monument in Istanbul.

A sacred lake with thousands of sacred carp and a biblical history.

The ancient abodes are a testament to human ingenuity amid harsh climates.

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

This famous city eluded concrete detection until the early 2000's.

This hunter-gatherer architecture is believed to be the oldest religious complex known.

In this historic region, homes and churches are carved into ancient volcanic rock formations.

Public water fountains built during the Ottoman Era still stand throughout this seaside town.

These caves secretly held national treasures during World War II.

This small museum once served as a royal hunting pavilion for King Otto Friedrich Ludwig.

According to legend, this cavern holds the passage that Persephone used to travel to and from the underworld.

This 15th-century island fortress later served as home to the executioners no one wanted to live near.

Legend says this sacred tree was a gift from goddess Athena.

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

This arch granting triumphal entrance into Antalya was designed to honor the emperor's visit.

This general store has stood in the same spot for well over a century.

Hans Christian Andersen for the postmodern world.

Railroad officials in the early 1900s sought to spare travelers the sight of Roman soldiers’ private parts.

A tribute to the pop culture icon overlooks this Washington D.C. intersection.

On the Fourth of July this area will transform into a Pompeii-like storm of falling embers and ash.

The 5.5-mile ring of steel posts around the Capitol Building is one of the largest (and most uniform) of its kind in the world.

The innocent intentions of this monument are somewhat lost in the sculpture's muscled imagery.

This statue of one of baseball’s greatest pitchers looks like something out of a sci-fi horror movie.