People of the Plum Bayou culture built these enormous mounds over 1,000 years ago.

These bamboo and rope bridges cross the Nam Khan River for six months every year.

Romans decided this 16th-century "talking statue" was so ugly, they named it after a primate.

A large replica of a monumental Roman inscription is located on the side of this museum.

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

A forgotten "city of water" underneath the famous Trevi district.

A deep mark on the remains of a Roman temple, believed to be left by a legendary warrior.

The remains of this 2nd-century Roman temple are incorporated into a modern building.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

A massive marble foot is tucked away in a small alley near the Pantheon.

This statue is the only female representation of Rome's "talking statues."

A statue representing a lost Roman profession that was vandalized for centuries.

The ruins of this monumental city founded by the first Roman Emperor are strangely overlooked by most travelers.

Built some 700 years ago, this Taíno ceremonial site features ball courts, petroglyphs, and evidence of ancient astronomy practices.

The oldest olive tree in Greece has been bearing fruit for at least 2,000 years.

Qshla Koya is an Ottoman fortress located on a hillock in the central quarter of Koya.

Celebrated as a center of civilization, the remains of the ancient city have been nearly destroyed by greed, egoism, and war.

A 19th-century fortress and collection of artifacts offer a tour of Saudi history.

An unfinished tomb carved into a giant boulder in the Arabian Desert.

Lions carved into the rockface adorn these two tombs built into the mountains of Dadan.

More than 100 monumental tombs carved into rock are preserved at this ancient Nabataean site in the Arabian Desert.

Remains of an abandoned coral city.

Crumbling pyramids and temple ruins stand within the shadow of this sacred butte.

These Nubian pyramids are strange and unique, even by pyramid standards.