The land is home to swimming ponies and a legendary 18th-century treasure.

A historic grist mill and active sluice on the Black River.

There’s a hidden military meme engraved on the World War II Memorial.

This mysterious structure by the Washington Monument is a flood barrier designed to protect the White House against rising waters.

A derelict bit of infrastructure from the canal that once ran through D.C. is landlocked in the heart of the city.

A monument in Washington D.C. marks the spot from which all other roads were supposed to stem.

Legend has it that President Grant’s frequent drinking in the lobby gave rise to the term “lobbyist.”

This nine-story building is the oldest standing skyscraper in D.C.

A three-story tower of books about Abraham Lincoln is one of the more unusual monuments to the president.

The narrowest house in America is seven feet of pure spite.

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

This sandwich shop has a century-old elevator behind a sheet of plexiglass.

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

The only way to see Pittsburgh is from the top of this lookout point, just like the ancient members of the native peoples did.

Sections of the iconic limestone columns have been left uncleaned as a reminder of the city's polluted past.

A restored Pittsburgh house of God has been converted to a marvelous house of suds.

A model of a dinosaur that was named for Andrew Carnegie stands outside the museum that also bears his name.

A portion of the old Pirates stadium over which a defining home run once flew still stands even after the rest of the stadium was torn down.

The largest university building in the West is a gothic masterpiece containing dozens of theme rooms based on different countries.

This spot memorializes one of the greatest plays in NFL history, unless you happen to be a Raiders fan.

Found art has transformed this Pittsburgh neighborhood into a psychedelic dream.

This church in Pittsburgh is home to the largest collection of religious relics in North America.

There aren't too many operational funiculars around, but Pittsburgh has two!

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