This grisly effigy displays an early Christian martyr who was skinned alive and beheaded.

Third time's a charm, or in this case, two testicles are.

It's believed that the dead were once taken out of houses through these now walled-up doors.

Artistic tombs, monuments, and a beautiful "Hall of Fame" lurk inside this cemetery.

Two very green residential towers cleaning the air in one of Europe's most polluted cities.

This block in downtown Brooklyn was a hotbed of antislavery activism along the Underground Railroad.

The secret behind these nostalgic light fixtures: They're not as old as they may seem.

Perhaps the most storied New York City eatery, Delmonico’s reshaped American restaurants.

The site of the deadly Triangle Shirtwaist Factory Fire.

An aptly-named street near the birthplace of the modern LGBT rights movement.

The feral felines of Roosevelt Island have a small army of allies and an abandoned hospital all to themselves.

The only remaining building in New York to see the inauguration of a president is being slowly overtaken by a grocery store.

A fabulously bizarre surrealist sculpture by the late artist Leonora Carrington.

This stately clock was gifted from China's last imperial government to the people of Mexico.

An ode to a chess-loving diplomat.

These floating gardens show what Mexico City used to look during the Aztec Empire.

This ancient structure was built by a mysterious civilization that was largely destroyed by a volcanic eruption.

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

This "City of Books" holds a museum, library, and the complete personal book collections of five of Mexico's greatest thinkers.

One of the remaining markers of an era when Brooklyn and Flatbush were separate cities.

A modern addition to the Greenpoint skyline.

A towering Art Deco movie palace made to look like a Mayan temple.

Chicago’s last original drive-in restaurant is a family-run hot dog joint that started in 1948.

One of the last functioning antique elevators in Chicago.