A tunnel with windows, so you don't miss out on the impressive views.

The hike through a narrow river flanked by the 2,000-foot-tall walls of Zion Canyon is one of the best in the world.

This New England covered bridge is home to the tale of a jilted lover known to haunt the area.

Housed in a century-old building, this museum's dedicated not just to soft drinks, but to the free enterprise system.

The only road through the heart of Glacier National Park.

This 19th-century museum inside of a lighthouse is only accessible during low tide.

The longest continuous lava tube in Oregon.

The world's last remaining store of its kind.

Explore 10 acres of environmental sculptures.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

This ancient cave is home to a museum, bar, and is filled with fluorescent minerals.

This rugged area of red rocks and arches is often considered one of the most beautiful places on Earth.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

One man has installed bathtubs into the Utah desert floor to harness the powers of a natural hot spring.

Bizarre lunar-like landscape with thousands of large stone "hoodoos."

Contains a wealth of information about the first exploration and later use of the Green and Colorado Rivers.

The fifth-longest natural arch in the world, and the longest outside China.

Few things look more out of place than the electric blue ponds in the reddish-brown desert of Utah.

A house carved into a rock in the 1940s.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

New York's oldest magic store.

Elevated freight railway turned wildly successful urban park.

Hidden in an ordinary Midtown building is a one-room museum dedicated to the greatest escape artist.

This whimsical group of statues is a favorite of children who love to climb all over Lewis Carroll's beloved characters.