This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

The upstairs reading room is packed with millions of rare books, literary manuscripts, and historical treasures.

One of the largest, oldest, darkest, quietest motel rooms in the world.

In a 345-million-year-old cave that's 200 feet underground, dinner awaits.

The remains of a boarding school designed to forcibly assimilate Native American children.

A tribute to the statues of Easter Island along Route 66.

Don't blink or you'll miss it.

All of the 20 occupied houses in this mostly abandoned town feature some curious display of junk art.

A classic Route 66 landmark that was built with scrap lumber and is held together with kitsch and puns.

It would take you approximately an hour and a half to walk to the end of Mexico's largest pier.

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

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

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

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

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

One of the few places where you can visit a cenote and Maya ruins at the same time.

This natural marble cave is one of only five national monuments in Oregon.

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

Many people don't realize there’s a lot going on in—and below—the world’s tallest triumphal arch.

Gilded heaven for philatelists and architecture freaks, still in full working order despite sitting atop tremulous ground.

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

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

Frida Kahlo's childhood home, now a museum of her life and works.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."