Where you can hail your favorite fictional commanders-in-chief.

In suburban Maryland, a tree grown from seed flown to the moon stands almost forgotten.

Press 1 for knock-knock jokes.

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

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

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

Everyone and everything one man ever loved and lost, now stare into the East for all eternity.

Some of the oldest exposed rock formations in the United States.

A museum dedicated to man's boldest venture.

It's as if the herds walked straight out of a fairy tale into the Missouri wilds.

First crafted during the 19th century, the mill was fully restored in 1983.

In a historic steel foundry east of the Mississippi River, thousands of wooden crates hold the architectural remnants of buildings long gone but not forgotten.

This unique historical monument features large concrete spheres designed to resemble fallen stars.

An oft-overlooked, magically musical monolith that stands majestically between Arlington Cemetery and the Iwo Jima Memorial.

The word "Watergate" will forever be associated with the infamous scandal in 1972, but this fountain is famous in its own right.

Mysterious installations bring levity and light to a sometimes stodgy city.

Depending on who you ask, this controversial treehouse is either a charmingly creative child's playhouse or an illegal encroachment on public land.

Grand architectural relics gain a new life in this Pennsylvania warehouse.

Since the 1930s, this Pennsylvania town has celebrated the humble tomato.

Intricate storybook scenes are tucked inside these shadow boxes, which are tucked inside a library in the Pocono Mountains.

This park contains a number of standing stones meant to heal and inspire.

Twenty churches beautifully painted by 19th-century Czech and German immigrants in Texas.

A private collection of massive steel monsters guarding a Texas pipe works.

One man's collection of found art, sculpture, and ephemera adorns his two side-by-side homes.