This museum houses two of Mexico's most impressive Aztec monoliths.

This local emblem is the oldest and largest dragon tree in the Canary Islands.

The second-longest pier in the U.K. stretches a whole kilometer into the Irish Sea.

An engineering error ensured this cavernous 350-foot-long subterranean thoroughfare was never used as intended.

The ruins of the bathhouse used by the ill-fated last Aztec emperor still lie in Chapultepec Park.

The sophisticated hydraulic system of the Nazca civilization.

Known as the "Stairway to Heaven," this historic canal dates back to the 1700s.

These mysterious Viking chess pieces spent centuries hidden on a remote Scottish island.

In Coyoacán, a pair of coyotes crown a public fountain in reference to the ancient Aztec name of the borough.

A statue of the legendary Celtic warrior queen who fought the Roman invaders stands in one of the cities she once destroyed.

The western face was supposedly left clock-less to snub the Welsh.

The fierce beast perches atop a pedestal marking where the historic City of London gates once stood.

This strange sculpture of a menacing skull surrounded by sun rays was discovered at the foot of the Pyramid of the Sun.

This Welsh hotel is the spiritual home of the British 1953 Everest expedition, the first successful ascent of Mount Everest.

The "lost friend” is the most famous of the six moai statues that were removed from Easter Island.

This marine reptile was discovered by one of the 19th century's greatest fossil hunters.

This colossal ancient jaguar sculpture was used as a vessel for the hearts torn from sacrificial victims.

Clap your hands at the base of the pyramid, and the song of a sacred Mayan bird will echo through the air.

A magical sinkhole on the Yucatán Peninsula is adorned with mini waterfalls and hanging vines.

These spectacular, symbolic serpents lie within the shadow of the Great Temple.

A disquieting Aztec sculpture displays hundreds of stone skulls representing the victims of human sacrifice.

These ruins witnessed the final gathering of the failed Jacobite Rebellion.

The castle still holds traces of the abandoned Roman fort it was built atop.

Famously misunderstood wonder of the ancient world