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

Is this 47.7-mile stretch of highway the longest straight road in the United States?

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

The highest bridge in America was built for an almost unnervingly small amount of money.

One of the best examples of Art Deco architecture in the United States.

Nature's biggest mammal swims in landlocked Oklahoma.

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

The oldest continuously occupied public building in the United States.

Wedding chapel's mysterious spiral staircase said to be miraculously constructed.

This private mansion turned Catholic bishop’s home is an iconic Galveston building.

This historic hotel on Bathhouse Row in Hot Springs National Park has a storied history of gangsters and baseball greats.

This Arkansas town is known for its gangster history, its healing waters, and now its brews.

Circus cemetery for all the “showmen under God’s big top.”

This monumental Jesus is often referred to as "Our Milk Carton With Arms."

This haunted hotel built on natural springs once served as a hospital for a quack doctor promising a cure for cancer.

An extravagant western hotel where every floor is the "ground floor."

Site of the 1926 murder trial of Ernest Burkhart who was involved in the "Reign of Terror."

An oil baron's wild paradise and the winner of an ill-fated air race.

These massive mitts are made of 30 tons of devotional bronze.

This beacon for pre-radar pilots once guided Charles Lindbergh to a safe touchdown in Tulsa.

Sid Vicious famously punched a hole in the wall of this iconic music venue.

An acoustic anomaly with a mysterious cause sits in the heart of Tulsa.

Tulsa's historic skyscrapers define the oil boom era of Art Deco construction, and are known for their ornate arched lobbies.

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