It's safe—and permitted—to walk across these twin natural sandstone arches.

The oldest residential street in Europe also features an optical illusion.

A trading post in the North Pole where children send letters.

This futuristically sylvan church is a glass-enclosed marvel of modern architecture.

A life-sized recreation of the megafauna that once roamed this region is a feature at the birthplace of American paleontology.

This dreamlike museum is filled with the works of an influential surrealist artist whose name you may have never heard.

A winding, cliffside stretch of road overlooking the Delaware River.

In the 1950s, two women saved this grand theater in the Colorado mountains from demolition.

The 953 windows undoubtedly make this the world's most beautiful screened porch.

Inside this striking glass building, visitors can see thousands of dinosaur fossils in the positions that nature deposited them more than 150 million years ago.

Some 2,000 carvings show this rare desert spring has been an oasis for travelers for over a thousand years.

A frozen oasis lies beneath the scorching New Mexico desert.

A hulking remnant of Alaska's industrial gold mining boom in the 1920s.

This pebble beach is so beautiful that taking its rocks is against the law.

Crushed coral and crystals give the sand its signature coloration.

This gravelly, dangerous highway is the only road in the United States that leads to the Arctic Ocean.

Six neolithic sandstone boulders remaining from a dolmen.

Silver in the hills led to the speedy creation of this boom town and a lack of it saw the town abandoned nearly as quickly.

This nearly abandoned town was once a thriving mining community until a series of fires.

One of the world’s largest collections of petroglyphs records 2,000 years of human activity.

This strategically-placed fountain creates the magnificent illusion of mustangs galloping across a river.

In a largely deserted ghost town, a little brick building recalls its history as a gold rush hub and haven for outlaws.

400-year-old garden, restored to beauty.

The only surviving fragment of the lost Narragansett Pier Casino.