This replica of the Greek structure is in the heart of Nashville.

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

Outsider art meets paleontology at this roadside reptile repository.

The Grand Ole Opry's big voice came from a small home in rural Virginia where she was eventually buried.

Extraordinary objects lurk in this quintessential regional museum.

Art deco landmark on the outskirts of Washington, D.C.

The oldest continuously operating fish market in the United States.

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.

This lonely waterfront memorial to the men of the Titanic was erected by the "Women of America."

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

A whopping 14,000 copper coins cover this miniature fighter jet.

The United States' oldest Episcopal church still in active use.

The elevator hidden in a smokestack on Roosevelt's yacht now serves as a monument to the former president.

This 1830s store is believed to be the site of Harriet Tubman's first stand.

Historic home of America's sweetheart sharpshooter, Annie Oakley.

The haunting "Hell House Altar" is one of the few remnants of an abandoned college that has been a magnet for local legends.

A labor of love built by local hang-gliding enthusiasts, this ideal launch spot was outlawed by the authorities and has since been largely abandoned.

The whole world in one water tank.

A tribute to the beloved, kind-hearted "homeless mayor" of Silver Spring.

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

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

The rooster who crossed the road lives on forever in Takoma Park, Maryland.

A small 19th-century graveyard tucked away in the middle of a suburban neighborhood.

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