The remains of a community that was forced to move for a dam that never materialized still rot in this Pennsylvania park.

The highest point in New Jersey is marked by a massive, if simply named, obelisk.

Four, 18-foot-tall badminton shuttlecocks lie scattered about the lawn of a Kansas City museum.

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

Paths are maintained, but trees have taken over plots.

The universally beloved children's television figure is interred on a high hilltop in one of western Pennsylvania's oldest cemeteries.

This stately building in Alexandria, Virginia was built by Freemasons to honor one of their most famous members.

The house where John Wilkes Booth conspired with his co-conspirators.

The first purpose-built art gallery in the United States is once again open as a center of craft arts.

The first American department store, and home to the largest operating musical instrument in the world.

The highest point in Delaware is located under a trailer so this marker across the street will have to do.

This lakeside tower is the third attempt at getting a tourist destination to stick on the spot.

This pre-Revolutionary War grist mill ground corn and flour for soldiers in seven American wars.

England's oldest surviving hedge maze has been confusing visitors for over 300 years.

A haunting tribute to pioneering photographer Clover Adams.

The only Civil War battle in Washington D.C. took place near this highest natural point in the city.

Every year, over 25,000 monarchs overwinter in Pacific Grove.

A massive volcanic plug is now a protected area that hosts a number of bird species.

A second generation sun-powered marvel lights up the night.

A traveling postal dog covered 48 states and more than 140,000 miles, and he lives on as taxidermy, patched up with a rabbit's foot and a pig's ear.

America's Most Wanted's set resides in this tribute to the history of crime and punishment.

A former major munitions plant that has been converted into a sprawling art space.

A girls' boarding school inspired by the Chicago World's Fair, once abandoned, now restored to strange and scenic glory.

The remains of Martha, the last known passenger pigeon, serve as a tool to educate about conservation.