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

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.

Little Red Lighthouse under the George Washington Bridge.

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

This southwest-styled home in Santa Fe claims to be the oldest house in America thanks to an ancient bit of foundation.

This popular pilgrimage site offers a hole filled with holy healing dirt.

A small metropolis of Pueblo cave dwellings have been carved right into the hillside of this national monument.

A multi-storied adobe complex has been inhabited for more than a thousand years.

A daily replay of the experiment that proved the rotation of the Earth.

In which a local geological marvel becomes a quaint roadside attraction.

Sail through this subterranean show cave that is home to a legend that would go on to name nearly everything around it.

An obelisk commemorating Lincoln's role in connecting the coasts.

The world's only three-story rotary jail is now a museum to a bizarre trend in prison design.

The rusting remains are visible sticking out of the waters of the Delaware Bay.

A unusual sanctuary for abused and exotic animals in South Jersey.

World War II bunker still standing on the New Jersey beach.

Over 600 acres of idyllic open grassland honor Nebraska’s georgic storyteller.

A rancher expanding a natural spring for his cattle came up with bones – lots and lots of them.

A brick-paved former section of the historic coast-to-coast highway.

Other-worldly rock formations and ancient fossils abound in this unique stretch of Nebraska badlands.

This erect, phallic geological spire wasn't always named so domestically.

An experimental, automotive replica of Stonehenge.