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 world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

This spectacular track has run continuously since 1882.

The first declared National Monument in the United States.

This giant iron playfully pays tribute to an early 20th-century architectural trend.

A historic dam made famous for its turbines and feature in a Hollywood classic.

This winding road of 318 curves is a must-visit for (careful) motorcycle and sports car enthusiasts.

Who needs fancy modern water slides when this giant North Carolina rock works just as well?

The highest paved road in North America winds its way up Mount Blue Sky in Colorado to an altitude of 14,130 feet above sea level.

This sinkhole is disguised as a pond and named after the man who stumbled upon it.

Georgia's highest point was given its strange name thanks to a simple translation error.

A piece of outsider public art accompanied by a strange urban legend.

One patriotic farmer's ode to the 9/11 tragedy remains even after the farm changed hands.

This statue inspired by Renoir's famous painting embodies the jovial spirit of Key West.

One of the only memorials dedicated to journalists who died in combat.

Dothan, Alabama has been invaded by scores of anthropomorphic peanuts.

Man-made geyser that rises to the exact height of the Gateway Arch.

Georgia's first brewery is also one of its oldest surviving buildings.

Practice your Dirty Dancing lifts in the manmade lake where Johnny Castle himself did.

This too-low North Carolina railroad trestle is still a notorious big rig executioner.

This massive crater in the middle of nowhere was used to train astronauts for moon landings.

This abandoned ironworks was once the most important military supplier in America.

This shifting North Carolina sand dune is an odd little desert surrounded by oceanic forest life.

This massive solar system model is sprawled out across Maine's suburban wilderness.