The iconic D.C. restaurant where the Cuban Missile Crisis was negotiated, now a Walgreens.

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

One of the dwarven trees dates back to 1625 and survived the Hiroshima bombing.

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

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

A line of blue paint marks the route of the inaugural parade.

There’s a special club house at the top for the bell ringers.

Before Nixon, "watergate" meant canals.

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

A derelict bit of transportation infrastructure hidden in the woods.

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

The unique traffic pattern named for an influential urban planner is also known as the Pedestrian Scramble.

Washington's iconic carousel has a nice piece of Civil Rights history.

An unusually designed bridge from the 1920s was built to withstand the tides and winds of Maine.

Island ghost town detailing Flagler's folly in building the Overseas Railroad.

Turning night into day in Victorian-era Austin to thwart a serial killer.

The highest bridge in America was built for an almost unnervingly small amount of money.

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

Tracks near this Texas nature site were once thought to support the Creationist belief that man and dino coexisted.

The largest island on the great salt lake is home to curious creatures and strange stories.

A museum and shop on Bourbon Street located in the former home of the second Voodoo Queen of New Orleans.

Slyly buy a shake in the Parker Meridien lobby.

A Parisian exterminator's shop whose storefront displays stuffed rats hanging from traps.

What's left of the ruins of the 1893 Columbian Exhibition, or World's Fair, also known as the White City.