The tallest The Church of Jesus Christ of Latter-day Saints temple in the world soars above the Beltway.

This suburban house is made of dirt, and almost sparked a revolution in home construction.

Dogs, cats, horses, monkeys, frogs, and fish are laid to rest at the second-oldest pet cemetery in the U.S.

A benevolent, 16-foot-tall river dragon lives on a suburban lawn.

Giant acorn-shaped 19th century gazebo from which suburban Washingtonians gazed upon the original "silver" spring.

A remote horde of architectural treasures fit for Indiana Jones.

Two dozen pinball games hidden away inside a most unlikely location.

This scenic Maryland park was the site of one of the worst prison camps of the Civil War.

A haunting exhibit in a wildlife refuge center highlights threatened species and the conservation efforts needed to save them.

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.

Live data is transmitted from the Atlantic coast to instantly recreate the ocean waves in this fountain at the NOAA headquarters.

This simple convenience store sits on the location where the Ouija board was named—and has a plaque to prove it.

This Maryland farm is known for its amazing corn mazes and its 30-foot junkbots.

This abandoned Victorian-style house was built in 1884.

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

This English-inspired Maryland garden is home to acres of opulent plant life including bushes shaped into an entire fox hunt.

An intricately designed junk art house with four extravagant junk art cars hidden in the suburbs.

A hidden alley in urban Baltimore is a haven for graffiti artists.

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

A local farm's collection of unusual structures from a now defunct storybook amusement park.

This beloved Baltimore spot features caged dolls, a giant Pez collection, and many, many mannequins.

Bizarre Cavern.

A museum dedicated to exhibiting remarkable outsider art.