A set of rowhouses built for laborers at a glass company are the last of their kind in Annapolis.

Sip creative cocktails in the former vault of the Riggs Bank.

Fill your car with gas and your belly with mouthwatering Cuban cuisine at this takeaway inside a Citgo station.

Intricate, eye-catching, award-winning rubber sculptures liven up this Pennsylvania town.

Collecting 700 years of mechanical death-dealing, the NRA's sprawling gun museum is a revealing testament to the American obsession with armament.

This statue of the "father of television" stands prominently in the United States Capitol.

Rumor has it the uncarved lump behind the three famous suffragists is reserved for the first woman president.

A little marble compass above George Washington's (empty) tomb in the Capitol marks where D.C.'s four quadrants intersect.

The walls of the iconic dome are hollow and have a secret stairway.

A monument to one of the few Olympic flames ever to be lit outside of the host city.

Press 1 for knock-knock jokes.

This cast-iron canine is a beloved icon among the people of Johnstown and ice hockey fans everywhere.

This large stone residence served as a field hospital during the Battle of Gettysburg between stints as a tavern.

True to its name, this little house presents like a dollhouse, and surprising details are revealed with a quick peek through the window.

Every autumn, this grove of living fossils erupts in a blaze of brilliant golden-yellow leaves and stinky fruit.

An 83-foot tall granite obelisk honors the legacy of Dr. King in the heart of Norfolk's Black community.

The hulking remains of the Leesburg Lime Company Kiln lie dormant behind a historical marker close to the W&OD trail.

A historic Maryland home that once belonged to a man who has been called "the most insignificant" U.S. Supreme Court justice.

This millstone-topped marker details the history of a mill that served as a landmark for both Union and Confederate soldiers during the American Civil War.

An abandoned incline railway site is now a green space with six acres of trails connecting hilltop neighborhoods.

While seemingly a cruel joke, this bench actually honors an esteemed member of the community who passed away in 2006.

This covered bridge was used by both Union and Confederate troops during the Battle of Gettysburg in 1863.

Long before the Battle of Gettysburg occurred, dinosaurs roamed the area and left their footprints on this bridge.

This Civil War monument was designed by an eccentric architect and Gettysburg veteran.