Fresh wooden posts have been added to ancient holes to recreate a primitive henge clock.

Once one of the world's great cities, Cahokia was a place of religious worship, trade and mass human sacrifice before being mysteriously abandoned.

One of the oldest and tallest lighthouses still in service on Lake Michigan.

An artistically engineered dam designed to honor the relationship between humankind and nature.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

This public square capitalized on a single Eagles reference to bring some life back to an Arizona town.

See massive fossils that are over 200 million years old in northeastern Arizona.

This rusted car found in Petrified Forest National Park's Route 66 exhibit may be the most photographed abandoned car in the country.

An excursion train traverses a picturesque red-rock canyon along the Verde River.

The world's only teal arches exist in a city that cares more about its aesthetic than an Instagram influencer.

A spiritual vortex among the red rocks in Sedona.

Ute tour guides have been sharing the ancient dwellings and rock art inside this large park with visitors for more than 40 years.

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

Hidden inside this Arizona fast food franchise is an in-depth exhibit on the famed WWII counterintelligence program.

A diverse, expansive nature preserve in northeastern Kansas.

This vivid painted ceramic sculpture evokes the expansiveness of the prairie sky.

The site of an ancient Mississippian settlement that appears to have flourished during the 10th to 13th centuries.

This Indianapolis landmark offers a secret panoramic view of the city. 

Two hundred tons of pioneer artifacts were painstakingly recovered from a shipwreck at the bottom of the Missouri River.

The oldest bar in Missouri is hidden within a limestone brewery cellar more than 50 feet underground.

A 35-foot-tall fork stuck in the ground outside an office building in Missouri.

The show pony of cave systems, Fantastic Caverns manages to live up to its name.

Known as the "Cross At The Crossroads," this massive metal cross is just short enough to avoid the FAA.

A luxuriant botanical garden below sea level.