A haunting tribute to pioneering photographer Clover Adams.

D.C.'s first central library was born out of a chance encounter with the philanthropist whose name it bears.

The oldest building in the District of Columbia was preserved because of a mistaken connection to George Washington.

There's a crumbling old mansion inside the Smithsonian National Zoo.

This lonely waterfront memorial to the men of the Titanic was erected by the "Women of America."

The winding route passes through an enclosed alleyway, two tunnels, and leads to the White House basement.

There's a 12-foot-tall replica of the Washington Monument hidden under a manhole nearby.

A mere dot on the map in the great north woods is the first place in America to vote in Presidential elections.

Packed with gear and memorabilia, this museum chronicles the history of skiing and how its rise shaped New England.

This site was once the largest ski jump tower in the world.

The 92-foot-tall structure is based on the aircraft that carried the first Americans into space.

This store also houses a museum dedicated to the history of these small, historic community shops.

Pennsylvania’s creepiest roadside attraction is a haunting example of roadside kitsch.

Buildings that dynamite couldn't bring down were abandoned because of bathroom issues.

A history of the U.S. military, with a focus on Pennsylvania's contributions.

The site where nine miners were trapped underground for over 77 hours in 2002.

A eight-foot-tall statue resides in the heart of Pennsylvania anthracite coal country.

This vintage short line in Amish country runs passenger steam train excursions and still hauls freight.

At the end of a street is a statue with no indication as to why it was created.

In use from 1742 to 1910, only flat headstones were allowed in this cemetery.

This large stone residence served as a field hospital during the Battle of Gettysburg between stints as a tavern.

A huge railroad museum with over 100 pieces of rolling stock focusing on the railroad history of Pennsylvania.

This extraordinary model train layout covers over 1,700 square feet, with multiple trains running simultaneously.

George Washington, Alexander Hamilton, and Benjamin Franklin all slept at this humble inn.