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.

An amazing example of early-20th-century architecture, this church features marble transported from Utah.

This rudder is one of the few remnants of a shipyard that once operated on the banks of the Potomac River.

This quirky curiosity shop takes its cues from the world's bazaars.

The first public building in Savannah to offer air conditioning was a luxurious cinema that still operates today.

An early-19th-century hotel with a past that is steeped in the Civil War.

A herd of plastic cows hangs out under this transmission tower in rural Georgia.

An ode to this small town's big film history.

One of corporate America's best-kept secrets is also one of the most publicly displayed.

Atlanta's strange assortment of concrete pillars inspires reflection in some, confusion in others.

An underground magnet for ever-changing street art.

Georgia’s last drive-in movie theater is a relic of a bygone era.

Just a few miles from downtown Atlanta is a trail covered in a crazy collection of outsider art.

A late-night restaurant empire was launched from this humble storefront.

This simple stone memorial remembers a secret, Geneva Convention-defying interrogation base from WWII.

This stately building in Alexandria, Virginia was built by Freemasons to honor one of their most famous members.

The sci-fi villain is a little-known inhabitant of the U.S. capital's largest cathedral.

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

Death comes to anyone who dares to touch this concrete column.

These unusual rooms on wheels are holdovers from the 1960s.

At Washington's Dulles Airport is a satellite museum (no pun intended) with three quarters of a million square feet of aircraft history.

The last remaining location of a drive-up hot dog stand named after a local pool shark.

You could be standing at the site of one of D.C.'s most fatal tragedies and not even know it.

A historic ruin just 20 feet away from a busy highway onramp.