South Carolina's last remaining slavery auction house is now a museum devoted to its own tragic history.

This elaborate towering structure was once famed for its revolutionary height.

The United States’s oldest funicular railway glides up and down a steep Pittsburgh street.

Frank Lloyd Wright's most iconic home dangles over a Pennsylvania waterfall.

Only known mainland rookery of the threatened Stellar sea lion.

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

A monument to the center of the North American continent may be off by a few miles.

The U.S. Supreme Court's secret Cold War relocation facility in the mountains of North Carolina.

The highest point in North Carolina and the United States east of the Mississippi River, Mount Mitchell is named after argumentative explorer Elisha Mitchell.

The first American home of the isolated, egalitarian religion has a trove of Shaker architecture and artifacts.

This futuristic airport terminal was abandoned for decades before reopening as a hotel—with a vintage plane of its own parked out back.

The original Uncle Sam was actually a New York meatpacker who is buried under this historic grave.

A decommissioned military complex that's now a modern industrial park.

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

Visit the monolithic tomb of America's most famous general.

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

This quirky hot springs town known to locals as "T or C" was named after a radio show.

A multi-storied adobe complex has been inhabited for more than a thousand years.

Legends surround this jagged rock formation in the New Mexico desert.

A smoke stack so large, the Washington Monument could fit inside!

An entire town preserved as a historic landmark.

The only road through the heart of Glacier National Park.