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

The story behind this beloved toy—named for Theodore Roosevelt and owned by his grandson—is more complicated than you might guess.

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.

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

The winding route passes through an enclosed alleyway, two tunnels, and leads to the White House basement.

A hidden gem on the lawn of the U.S. Capitol Building designed by landscape architect Frederick Law Olmsted.

The oldest continuously operating fish market in the United States.

This church built atop a gas station promises to "equip you for the next stage in your life’s journey."

The Pentagon is so large that it was planned like a city, complete with internal highway infrastructure.

The Pentagon sits on a former island that was in Virginia at low tide and D.C. at high tide.

Thomas Jefferson's estate is home to hundreds of varieties of historic fruits and vegetables.

The semi-reclaimed ruins of this canal were once part of an ambitious plan to reroute the mighty potomac.

This wildlife trust is dedicated to orphaned elephant rescue and conservation.

A glimpse at Walt Disney's vision for a "community of tomorrow," in miniature.

Florida might be at its most surreal in this museum devoted to the famed Spanish artist.

A suburban museum tells the story of a historic transportation network and even provides rides in antique trolley cars.

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

Easter in Westminster may be the only time and place to behold Edgar Allen Poe made entirely of Marshmallow Peeps.

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

While most wind tunnels test scale models, the "Cave of Winds" was large enough for actual airplanes.

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

On the Fourth of July this area will transform into a Pompeii-like storm of falling embers and ash.

The 5.5-mile ring of steel posts around the Capitol Building is one of the largest (and most uniform) of its kind in the world.

A 1,100-ton train fell through the floor in 1953. Workers got it patched up in just 72 hours.