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

The only working large-scale tea plantation in the United States.

One of the oldest living oak trees in the Southeast.

South Carolina's last remaining slavery auction house is now a museum devoted to its own tragic history.

Once the most flame resistant building in the country, the South Carolina Historical Society building was almost burnt down in a fire.

The taxidermy remains of the first mammal ever cloned from an adult cell are on display in Edinburgh.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

The rogue roots are gradually consuming some of the historic marble grave markers.

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

Though it's unclear why it's there, the lifelike sculpture of the giant lizard is oddly charming.

Alabama has a fiberglass Stonehenge. With apologies to Spinal Tap, this one is full-size.

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.

This robust fence in front of a historic Georgetown home is likely made from hundreds of recycled Revolutionary War firearms.

A derelict bit of infrastructure from the canal that once ran through D.C. is landlocked in the heart of the city.

Under a playground is a little-known sealed train tunnel that likely contains the bodies of workers trapped by cave-ins.

A tribute to the furry local heroes who helped get residents through many tough times.

The first park built over a freeway is a brutalist masterwork.

A celebrity from the late Cretaceous period.

Shoreline strewn with the remains of ghostly fallen trees.

A real (but thankfully not live) missile stands tall as a monument to the United States military in the small town of Cordele.

This titanic steel chain linking two buildings was installed without permission but instantly beloved.

A psychological self-portrait in the form of a giant, segmented head.

An overgrown collection of miniature buildings still stand as evidence of one couple's obsession with The King.

The world's largest fire hydrant is supposedly tornado-proof.