Herbert Hoover's "Brown House" rural presidential retreat was a PR disaster amid the start of the Great Depression.

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

Home of the physician who set the leg of John Wilkes Booth after the Lincoln assassination.

A local farm's collection of unusual structures from a now defunct storybook amusement park.

A lovely aquatic park built by a one-armed Civil War veteran who made a fortune from lotuses.

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

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

Walk a trail through a historic Quaker town that outlawed slavery in 1777 and was a major waypoint on the Underground Railroad.

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

Members of Congress have traveled between the buildings on Capitol Hill for a century hidden from tourists, press, and storm clouds.

The world's oldest continuously operating airport was founded by the Wright Brothers.

Long-abandoned trolley tunnels just a mile away from the White House are turning into an art space.

A Norwegian-born sculptor created these soaring guardian angels at the entrance to Hoover Dam.

The "Seinfeld" diner.

The grand marble structure next to the White House is Andrew Carnegie's temple to Pan-American diplomacy.

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

Berkeley Hot Springs presents to you "the only outdoor monument to presidential bathing."

The bridge's highly-contested plaque (once again) honors Confederate President Jefferson Davis.

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

An extensive, if one-sided, history of U.S. law enforcement's war on drugs.

Once home to seven different roller coasters, Glen Echo has undergone many transformations since its founding in 1891.

Once the supplier for noteworthy projects like the National Cathedral, this old brickworks now lies abandoned.

You could be standing at the site of one of D.C.'s most fatal tragedies and not even know it.

One of the largest collections of Catalan literature and cultural materials outside of Spain, created by a community of 1960s expats.