This Maine bridge may be the last wire-supported bridge of its type in the world.

One of the steepest streets in the United States makes an intriguing challenge for cyclists.

Once connected to the outside world by a single train track, this ghost town is looked after by the National Park Service.

The world's largest fully steerable radio telescope.

An abandoned marine theme park has created a difficult experiment in dolphin rewilding.

This rural community has attracted both scientists and techno-refugees due to its federally-mandated lack of technology.

A bronze plaque at an intersection in Hoboken marks the place where the game of baseball first took shape.

When the Austin Dam failed it destroyed much of Austin...and then it failed again.

Contrary to what one might expect, ice forms inside this small cavern during the summer and melts during the winter.

A toxic ghost town sitting atop a massive coal fire.

This lush forest valley was once mined for lumber to the extent that it was once nicknamed "The Pennsylvania Desert."

Over 100 concrete munitions bunkers are all that remain of a Pennsylvanian village seized by the US government.

Several times a year, during low tide, two pairs of historic train tracks are revealed on this New Jersey beach.

The rusting remains are visible sticking out of the waters of the Delaware Bay.

A wrecked ship dating back to the American Revolution was only recently discovered off the Delaware coast.

This former asylum for Black Americans is haunted by its history of violence and racism.

Baltimore's classic clock tower was once topped by a rotating, 20-ton medicine bottle.

One of the oldest anatomical theaters in the U.S. still in use was once the site of an infamous cadaver riot.

It's not hard to see why the historic Peabody Conservatory of Music's library has been described as a "cathedral of books."

A hidden gem on the lawn of the U.S. Capitol Building designed by landscape architect Frederick Law Olmsted.

The site of the climactic scene from the classic horror film is now a historic landmark.

An easily overlooked memorial to a Ukrainian famine-genocide that killed over 4 million people.

A historic estate packed with George Washington's heirlooms, and its own nuclear bunker.

The hidden offices underneath Memorial Bridge have been locked up since 1976.