Decades before the scandal, this staircase on the river was a literal "water gate."

The national park was once a plantation estate.

The beloved statue at the National Academy of Sciences is oh so inviting to sit on.

Fittingly, America's museum of architecture is itself a magnificently designed old building.

A lone historical marker off the highway and scattered debris are all that remain of this Cold War-era missile site.

At Washington's Dulles Airport is a satellite museum (no pun intended) with three quarters of a million square feet of aircraft history.

Collecting 700 years of mechanical death-dealing, the NRA's sprawling gun museum is a revealing testament to the American obsession with armament.

Commemorating the spot where the famous scientist fed his pigeons.

There must be a pun in this haystack somewhere...

The seat of Buffalo government is a gorgeous Art Deco palace.

These unusual rooms on wheels are holdovers from the 1960s.

The romance of early commercial flight still fills this Art Deco destination.

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

Located at the former Lorton Prison the Lucy Burns Museum tells the story of the 91 year history of the prison including the dark chapter of its involvement in the women's suffrage movement.

This isn't your average roadway—it's actually a National Park and a transportation pioneer.

This lovely picnic spot featuring thunderous jet landings is an aircraft spotter’s dream.

America's first federal monument.

At 207 feet, one of the world's longest continuous escalators.

This Virginia railway overpass is said to be haunted by a serial killer in a rabbit costume.

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

The last of Philadelphia's wood-paved streets is now a landmark of terrible engineering.

The first American axe throwing club.

The sounds of the world's largest fully functioning pipe organ dazzle shoppers at a Philadelphia Macy's.

This dramatic rail curve was once the target of a failed Nazi attack.