This otherwise ordinary close on the Royal Mile constituted the end of the world for Edinburgh’s poorest residents.

This gem from the industrial age helps visitors and residents alike traverse hilly Stockholm.

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

This charming old building's loose connection with the Scottish Reformer is what saved it from demolition after it split apart.

The small first-floor apartment where the author wrote her Pulitzer Prize-winning book 'Gone with the Wind.'

This giant boulder is sandwiched between apartment complexes in upper Manhattan.

The oldest monument in Marrakesh and the city's only surviving example of Almoravid architecture.

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

Touching this 18th-century Scottish philosopher’s toe allegedly conjures good fortune.

These haunting ruins of a 700-year-old Prehispanic city have witnessed centuries of wars and massacres.

Fortune tellers, snake charmers, poets, and storytellers all gather on this historic square in Morocco.

This giant iron playfully pays tribute to an early 20th-century architectural trend.

This foreboding building was the headquarters of the terrifying Spanish Inquisition in Mexico.

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

This macabre masterpiece of a mural is one of Francisco Goya's "Black Paintings."

A Gothic-style abode built to accommodate the church's three resident peacocks.

A curious fountain that has no water and includes Satan, a crab, and 9 giraffes.

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

These enigmatic columns tower over the ruins of an ancient Toltec city.

A three-story copper skybridge connects two Manhattan buildings with Art Deco luxury.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

Manhattan’s Battery Park has a whimsical carousel full of spinning, glowing fish.

CDMX's home for the world's culinary delights.

A curious memento mori hangs in the magnificent Cathedral of Segovia.