The ruins of an ancient temple to the Aztec wind god discovered in the middle of a metro station.

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

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

A bronze statue of the famed Prussian naturalist commemorates the year he spent in Mexico.

The only castle in North America to ever house European sovereigns.

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

One of the oldest living oak trees in the Southeast.

South Carolina's last remaining slavery auction house is now a museum devoted to its own tragic history.

Thirteen pastel palaces in downtown Charleston add a gorgeous splash of color to the city.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the first ‘Harry Potter’ film.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

The remains of the great moral philosopher reside in a university in London.

The John Snow Memorial marks the epicenter of London's 1854 cholera epidemic.

Deep in the Guatemalan jungle stands an ancient pyramid that once marked the reign of a king.

These roaring primates were considered a divine creature in the cosmology of the Maya.

Monkeys inhabit the lush forest surrounding ancient Mayan ruins once considered sacred.

A portrait of the Charter Oak hangs in a frame made from the Charter Oak.

The former home of Samuel Clemens and family remembers the happiest period of the author's life.

The author of Uncle Tom's Cabin was neighbors with Mark Twain while living in this Connecticut home.

An iconic steel and chrome diner from the 1940s left empty for nearly 20 years is in danger of being demolished.

An abandoned gun-funded 19th century utopia.

The oldest place in Hartford is a cemetery with thousands of bodies stacked beneath the grass.

The religious shrine that Pablo Escobar's men would allegedly visit before completing a mission.

Three hundred illuminated pillars form an “artificial forest” in Medellín.