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

This incredible college library is a visual masterpiece of mosaic art. It also looks kind of like a giant boombox.

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

The enigmatic and seldom visited ruins of a Mayan city-state.

The masses at this church incorporate enough moonshine and animal sacrifice that they are no longer recognizably Catholic.

Every equinox this Maya pyramid puts on a spooky ancient light show.

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

Iconic red and white plaques show the creative names invented to navigate the city streets.

Cars mysteriously roll uphill on this street.

An enigmatic mural hiding in plain sight in one of São Paulo's busiest metro stations.

A snake farm famous for its venemous varieties.

The pedestrian traffic signals in Brazil's teeming metropolis light up with clues to nearby landmarks.

Off-limits and full of venomous pit vipers, Brazil’s Snake Island has a frighteningly apt nickname.

Solitary monument dedicated to the beauty of nature.

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