One of the oldest lighthouses in the world, this structure was built more than 800 years ago.

This metal tower in the desert provides views of a handful of Nazca geoglyphs.

This archaeological museum in one of Peru’s most intriguing regions exhibits ancient artifacts from the Nazca civilization.

The scant remains of this flooded historic village can be explored in one of the most remote areas of the Great Smokies.

A beautiful geyser under environmental threat.

The only natural lake in the world that drains into both the Atlantic and Pacific Oceans.

Creek water that starts here has a 50/50 chance of ending up in the Atlantic or the Pacific.

A Route 66 filling station that was designed to resemble the Hagia Sophia, and is now the symbol of an arts district.

This giant mimetic milk bottle has encouraged Route 66 travelers to choose dairy since 1948.

Built in 1547, these ruins lie on a rocky promontory in Ballintoy jutting into the wild ocean waters below.

Ireland's most northerly island is hauntingly beautiful. Its lighthouse was the last glimpse of home for many Irish emigrants bound for the U.S.

The site of Billy the Kid’s most famous escape and the end to the Lincoln County War.

More than 21,000 images fill this overlooked gem of a prehistoric site.

The final resting place of the living embodiment of the famous Forest Service symbol.

A quirky mishmash of Route 66 memorabilia and other throwbacks from the past.

This canyon is named for a unique geologic formation where the river vanishes underground near the mouth of the canyon and reappears farther down.

Dedicated to the largest armed uprising in American history since the Civil War.

In 1857, the Mardi Gras parade tradition began at this intersection.

Writers such as Paul Bowles, William Burroughs, and Samuel Beckett frequented this Tangier bookstore.

The ruins of a 19th-century mill are hidden along a greenway in a prominent Charlotte neighborhood.

This hidden gem in Arizona is truly worth the rugged journey.

The site of an improbable and ill-fated attempt to use dammed floodwaters for irrigation.

One of the "twins" in these falls on the Snake River was sacrificed for hydropower generation in the 1930s.

A well-preserved sheepherding camp now lies in the heart of the Granite Chief Wilderness, in the high Sierra Nevada.