Remnants of a storybook amusement park hidden behind a strip mall.

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

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

The longest escalator in the Western Hemisphere takes over three minutes to ride down.

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

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

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

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

The actual model from the original "Star Trek" series is now on display at the National Air and Space Museum.

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

The little-known, 300-year history of the area includes former lives as a bustling tobacco port, parking lot, and industrial dump.

The United States Capitol's former columns still stand.

America's Most Wanted's set resides in this tribute to the history of crime and punishment.

Home to items never before seen by the public.

The first purpose-built art gallery in the United States is once again open as a center of craft arts.

A traveling postal dog covered 48 states and more than 140,000 miles, and he lives on as taxidermy, patched up with a rabbit's foot and a pig's ear.

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

The Byzantine, pre-Columbian, and medieval art at this stately mansion are some of the most under-appreciated collections in D.C.

With over 100 jam-packed rooms to explore plus elaborate tea services and events, the Mansion on O Street is a hidden treasure.

Politicians, bureaucrats, and military officers gathered in this field near the Capitol to settle their disputes with blood.

The tallest The Church of Jesus Christ of Latter-day Saints temple in the world soars above the Beltway.

A girls' boarding school inspired by the Chicago World's Fair, once abandoned, now restored to strange and scenic glory.

An astounding collection of medical specimens, including bits of President Lincoln.

Giant acorn-shaped 19th century gazebo from which suburban Washingtonians gazed upon the original "silver" spring.