A star fort along the C&O Canal in western Maryland that protected America in three wars.

This beautiful stone arch bridge wasn't even expected to stand for one day, but people have been crossing it for centuries.

A relic of FDR's brief foray into utopian urban planning.

Trinkets and toys lovingly handmade by maximum security prisoners.

When the town wouldn't allow the fast-food behemoth to build a new restaurant, they put one inside an 1850 home.

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

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

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

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

The 72-foot giant escaped confinement in a large patch of mulch only to be reburied in the sandy shores of the Potomac River.

George Washington once stopped by this house for dinner.

This Georgian-style house built in 1746 is the oldest surviving structure in Bladensburg.

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

A historic cemetery with unique artwork, a Civil War fort, and also happens to be the site of the Battle of Bladensburg.

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

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

The Corinthian columns that towered over Abraham Lincoln’s inauguration stand proud.

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.

"Congress may voluntarily remain in session throughout the summer, in order that our Congressmen may be protected from the intolerable discomforts and dangers of the ordinary outdoor weather!”

A secret greenspace hides atop a Capitol parking garage.

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

A museum cafe showcases Native American dishes and indigenous ingredients from across the Western Hemisphere.

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

An elaborate, hidden model train in the Needham Town Forest.