Home to an astounding collection of carved skulls and other artifacts from Puebla's history

Beneath the most controversial monument in Mexico City is a cultural center that exhibits only digital art.

This pre-Hispanic apartment complex also includes ancestral paintings that point to its military past.

A striking depiction of Teotihuacan's mysterious "Spider Woman."

Dating back to the second century, vestiges of prehispanic mural paintings are found in this underground palace.

A neo-Gothic church built to thank God for saving the Emperor of Austria from an assassination.

One of the world’s largest cave systems houses legends, concerts, and wondrous rock formations alike.

Historic poems about the noble act of defecating have been preserved on the wall of this old convent.

The fighters and conspirators that won independence for Paraguay held secret meetings at this historic house.

Monumental paintings, discovered in a Mexican cathedral in 1957, depict the deaths of some friars in Japan.

The conquistador's former fortress is the oldest preserved colonial building in the Americas.

This amazing collection includes rare stamps from around the world, including fluorescent ones.

An incredible collection of Mesoamerican art assembled by one of Mexico's great artists.

A 16th-century monastery boasts a lush array of plants native to Mexico’s most biodiverse region.

Cathedral carved out of salt, located a mile below the Earth's surface.

A plaque marks the spot where the saint was shoved off the Charles Bridge and into the river.

The slender brass strip in Prague's Old Town Square was used to tell time from 1652 to 1918.

A turn of the century building boasting some of the most beautiful art nouveau architecture in Prague.

This monument on Breed's Hill proves that one of the most famous battles of the Revolutionary War is misnamed.

The site of Paul Revere's historic two lantern warning.

A Mexican Romeo-and-Juliet-esque legend has given this super-narrow alleyway a reputation for romance.

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

High atop a Mexican rainforest mountain, this ancient pyramid once drew pilgrims countries away.

No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.