The tunnel under the Capitol Building where Congress takes out its trash.

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

An overlooked memorial honoring the local Washington residents who died in World War I.

Architecture lovers won’t stop touching the National Gallery's 19.5 degree marble prow.

Light bulbs, scrap wood, and tinfoil comprise this homemade throne of the gods.

The "lovely red Vega" of the legendary record-settling pilot.

Garments from across the globe call this hidden gem home.

One of the three perfect vellum copies of this historic book known to exist is on display in a specially-designed case.

Coins and medals straight from the mint await visitors to this shop in the nation's capital.

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

Was there a small "backpack nuke" hidden in the attic? JFK apparently thought so.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

This supermarket is suspended 25 feet above an interstate highway.

This quirky piece of naval artillery has been deafening Canadians for over a century.

Dedicated to a colonial woman who was hanged for being a Quaker.

The once-abandoned 140-year-old hotel used in the movie "In Dreams."

Wander the sprawling living museum on the site of one of a 16th-century community.

One of the most scenic falls in Massachusetts has a history of death and grim legend.

One man's swirling six-acre monument of stone.

A small Second Empire-style building is one of only seven remaining lighthouses on the Hudson River.

The last remnants of Fort Pitt also hold the distinction of being the oldest structure west of the Allegheny Mountains.

A portion of the old Pirates stadium over which a defining home run once flew still stands even after the rest of the stadium was torn down.

Sections of the iconic limestone columns have been left uncleaned as a reminder of the city's polluted past.

From bench to vandalism to art, this silly prank seat was funny enough to become permanent.