An ancient Greek monument and a Byzantine church coexist inside this cave.

View the ancient remains of buildings and the ancient "River of Hades" before hopping on a train.

Where commuters walk through remnants of an ancient Greek necropolis.

This portion of a lovely Belize beach is infested with (harmless) sharks and rays.

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.

Where Saint-Martin ends and Sint Maarten begins (or vice versa).

The capital of the Cayman Islands is a center of offshore banking, but gets battered by blistering hurricanes.

The beginning of the historic Iditarod Trail connecting the Alaskan cities of Seward and Nome.

Considered by many to be one of the most dangerous highways in Alaska.

During the summer, surfers in Alaska take advantage of this inlet’s unusual water patterns.

The king of U.S. high points towers over every other peak on the continent.

An interesting decoration on this historic site, this weathervane comes with as many legends as it does questions.

Memorial of the Salem witchcraft hysteria in the town of Danvers, where it all began.

The 340-year-old house that inspired the classic Nathaniel Hawthorne novel.

"We Seceded Where Others Failed."

This spiny beast guards an artist's village while vying for the title of largest lobster in the world.

A grassroots community effort in the 1970s led to the creation of this beautiful garden full of delightfully whimsical exhibits.

South Carolina's last remaining slavery auction house is now a museum devoted to its own tragic history.

A 315-foot spire jutting out from the Blue Ridge Mountains makes for breathtaking views.

This too-low North Carolina railroad trestle is still a notorious big rig executioner.

This winding road of 318 curves is a must-visit for (careful) motorcycle and sports car enthusiasts.

This roadside attraction has been serving out its fair share of hearty folklore and chaos since 1858.