These subterranean models show Mexico City's central square during three different eras.

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

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

A small collection of iguana-infested ruins hides amid Cancún's bustling hotel zone.

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

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

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.

This sprawling, formerly elite sporting complex in Amman, Jordan has become a local picnic spot.

Perched above the bustling town of Kerak is a sprawling, ruinous castle that has witnessed nearly a millennia of Levantine history.

A bathhouse from the second Islamic Caliphate decorated with frescoes of constellations, pleasure gardens, and naked ladies.

Concentrated around the Dead Sea, these surprising canyons are filled with coursing water, fish, and even crabs.

The world's oldest map of the holy land gives us a fragmented glimpse of the layout of biblical nations.

Known as the "Valley of the Moon," this Jordanian wadi is one of the most amazing desertscapes on Earth.

This exceptionally well-preserved ancient marvel also houses a small museum dedicated to Jordanian folk tradition.

Gladiators battle and chariots race daily in the ruins of a once-great Roman city.

An ancient capital city that dates back 3,000 years and harbors many surprises.

A more chill but no less fascinating version of the famous ancient archeological site.

These falls, sometimes called the "Niagara of the West," still put on a good show at the right time of year.

Home to the deepest rift anywhere on Earth.

This museum is a full-size replica of an original church constructed during the 13th-century.

It takes a nine-mile hike to reach these hot springs, but weary hikers are rewarded with stunning views and a warm soak.

All that remains of this once-booming mining town are the ruins of a saloon.

Crystal clear lake with a shoreline of travertine located in a Colorado canyon.