Tubing through a cave lit with glowworms is a magical underground experience.

Taihape's claim to fame is a fictional Kiwi farmer wearing gumboots.

The "punniest place on Earth” has nearly as many bull-themed puns as it does people.

Part of a WWII submarine is lurking outside the Washington Navy Yard parking lot.

The oldest building in the District of Columbia was preserved because of a mistaken connection to George Washington.

On the Fourth of July this area will transform into a Pompeii-like storm of falling embers and ash.

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

When it comes to handsignals (and colonialism) rock always beats scissors.

Perhaps the most scandalous statue of America's first president.

The national park was once a plantation estate.

This lovely pocket park is one of the most under appreciated in D.C.

The oldest continuously operating fish market in the United States.

While most wind tunnels test scale models, the "Cave of Winds" was large enough for actual airplanes.

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

The U.S. Navy’s preposterously detailed mini battleship took 77,000 hours to complete.

One of the largest artillery pieces in the world sits in a Washington D.C. parking lot.

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

These four islands right offshore have waterfalls, colorful lights, fancy buildings, and a secret purpose.

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

FDR's Art Deco hospital tower was hopelessly inefficient.

The Pentagon is so large that it was planned like a city, complete with internal highway infrastructure.

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.

The little-known, 300-year history of the area includes former lives as a bustling tobacco port, parking lot, and industrial dump.

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