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

Members of Congress have traveled between the buildings on Capitol Hill for a century hidden from tourists, press, and storm clouds.

Built by the patriotic residents of Boonsboro in a single day.

Look closely and you’ll notice that the color changes a third of the way up the tower.

Once the supplier for noteworthy projects like the National Cathedral, this old brickworks now lies abandoned.

One of the dwarven trees dates back to 1625 and survived the Hiroshima bombing.

A lovely aquatic park built by a one-armed Civil War veteran who made a fortune from lotuses.

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

This seemingly out-of-place gas station by the Watergate hotel was once described as the most expensive gas station in the world.

The longest escalator in the Western Hemisphere takes over three minutes to ride down.

An astounding collection of medical specimens, including bits of President Lincoln.

A girls' boarding school inspired by the Chicago World's Fair, once abandoned, now restored to strange and scenic glory.

The remnants of a wooden-hulled fleet built and abandoned in WWI, now home to a thriving ecosystem.

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

This isn't your average roadway—it's actually a National Park and a transportation pioneer.

The last holdout of a pre-Civil War rebel who took the matter of slavery into his own hands.

One day a year it is legal to jump off of this astoundingly tall bridge that spans an Appalachian gorge.

A traveling postal dog covered 48 states and more than 140,000 miles, and he lives on as taxidermy, patched up with a rabbit's foot and a pig's ear.

The country's oldest continually-operated mini golf course lies hidden in plain sight, eclipsed by one of D.C.'s most popular tourist attractions.

A monument in Washington D.C. marks the spot from which all other roads were supposed to stem.

The bank that helped fund the Mexican-American War and the purchase of Alaska met its downfall after helping Augusto Pinochet launder money.

Home to items never before seen by the public.

The world's smallest drawbridge.

Storms, funding, and in-fighting have kept this Bermuda church from ever being completed.