America's first federal monument.

A historic arena where the Beatles played their first concert in the U.S.

Berthed at the Charlestown Navy Yard in Boston, "Old Ironsides" is the oldest commissioned warship still afloat.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

Enormous piles of historically significant stones, dumped by Congress in a forest, and abandoned for 60 years.

A diminutive memorial marks the site of a successful assassination by a right-wing death squad in America's capital.

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

Helen Keller once broke ground on this historic center for the study of technologies to benefit the hearing impaired.

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

This collection honors the iconic, and proudly American lighter that just won't quit.

A tradition unlike any other, this marks the site of the annual Groundhog's Day tradition.

A toxic ghost town sitting atop a massive coal fire.

"Dark Sky Park" is heaven on Earth for astronomers, one of the rare U.S. locations with no artificial light pollution.

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

Once the "Eighth Wonder of the World," this iron railroad bridge was decimated by a tornado.

Pennsylvania's highest point is spotted with boulders which were pushed to the surface by nothing but cold.

Memorializing an American tragedy of massive proportions.

An enthusiastically interactive mining museum that won't let black lung ruin the fun.

A haunting tribute to pioneering photographer Clover Adams.

By day this New Orleans square is for pedestrians, but by night it is a kingdom of kittens.

Experience a charming 1930's version of "infotainment."

The privately owned cemetery that holds room for Washington's finest when they step down from life.

A Civil War fort in the middle of Washington, D.C. has been swallowed by a forest.

Giant acorn-shaped 19th century gazebo from which suburban Washingtonians gazed upon the original "silver" spring.