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

This distinctive Crescent City tradition dates back to the days of horse-drawn carriages.

The world-record holder for the longest bridge stretching continuously over water.

This former asylum for Black Americans is haunted by its history of violence and racism.

This bug-eyed water wheel uses the power of the Sun to clean up Baltimore Harbor.

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

The final resting place of the tragic king and queen of the Jazz Age is tucked away in a small Maryland graveyard.

Once home to seven different roller coasters, Glen Echo has undergone many transformations since its founding in 1891.

Fittingly, America's museum of architecture is itself a magnificently designed old building.

A gorgeous mural outside a beloved D.C. restaurant pays homage to famous Black Americans.

The first memorial dedicated solely to the Black troops who fought for the Union.

An Industrial Revolution-era public work that purified water using nothing but sand.

The taxidermy remains of the most popular pony in children's literature.

The land is home to swimming ponies and a legendary 18th-century treasure.

Iceland's "Smoky Valley" is a beautiful river that is shrouded in a constant cover of steam clouds.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

More than 5,000 contemporary and "historic" mustards from around the world.

This grand gothic brewery has been pumping out suds for over a hundred years.

Three abandoned missile silos are hiding in plain sight behind a suburban development in Maryland.

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

Eighteen miniature death-scene dioramas.

Proto-CIA agents trained with grenades in the sand traps and fired machine guns from the fairways.

Was there a small "backpack nuke" hidden in the attic? JFK apparently thought so.

The Virginia farm where John Wilkes Booth met his grisly end is now largely forgotten.