On the side of Arkansas' Great River Road stand the remains of a forgotten World War II POW Camp.

This imposing Masonic temple a mile from the White House was the first public library in Washington, D.C.

Look closely and you’ll notice that the color changes a third of the way up the tower.

The most accurate timepiece in the world.

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

The bank that helped fund the Mexican-American War and the purchase of Alaska met its downfall after helping Augusto Pinochet launder money.

This grand gothic brewery has been pumping out suds for over a hundred years.

A wondrous old library overlooking the nation's capital.

Parking garage where Bob Woodward met Watergate source "Deep Throat."

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

Before Metro, Washington had a robust streetcar network—and you see the remains of this infrastructure if you know where to look.

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

This seemingly out-of-place gas station by the Watergate hotel was once described as the most expensive gas station in the world.

Before Nixon, "watergate" meant canals.

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

One critic described it as "middle Mussolini, early Ramses, and late Neiman-Marcus." Another called it an architectural "natural disaster."

This fort down the Potomac from Washington, D.C. was once the only defensive fort protecting the capital.

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

This rare triple-jurisdiction drawbridge passes through Virginia, Maryland, and Washington, D.C.