The controversial urban planner who designed Washington, D.C., was buried in Maryland, and can presently be found in Virginia.

Look closely and you’ll notice that the color changes a third of the way up the tower.

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

This Moab institution functions as both a rock store and a small natural history museum.

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

A monument to the one-armed geologist who led the first documented expeditions through the Grand Canyon.

A Norwegian-born sculptor created these soaring guardian angels at the entrance to Hoover Dam.

The neon signs from Las Vegas' past find their final resting place at this unusual graveyard.

If there's another drive-through golf-cart bar in a bat-filled cave on top of a mountain, we don't know about it.

Two gushing waterfalls of hot spring water within a block of each other.

This funicular railway rumbles along for a mile up the nearly vertical face of Chattanooga’s Lookout Mountain.

A recreation of the doomed ocean liner in the middle of the Smoky Mountains.

The highest point in Tennessee, Clingmans Dome bears witness to the ravages of one type of insect.

Enormous lake at the bottom of a unique cave system.

Where beautiful signs live on forever.

The only way to see Pittsburgh is from the top of this lookout point, just like the ancient members of the native peoples did.

There aren't too many operational funiculars around, but Pittsburgh has two!

This functioning mill was built in the 1970s using parts from several other West Virginia mills.

There are more than 4 million bricks inside this unofficial Lego museum in a former middle school.

The tallest waterfall in West Virginia.

Hundreds of 19th-century characters descend upon an Ohio town every autumn.

An office built to look like a giant basket.

In 1952, a strange encounter in the woods of West Virginia led to the legend of a 10-foot-tall monster with glowing eyes and a distinctive style.

The failure of one component toppled this entire bridge during rush hour.