Down the road from where the Wright brothers lifted off is another flight tribute practically hidden from sight in the woods.

Rusting, graffiti-covered tanks litter the beach of this island, once used by the U.S. military for target practice.

A sharply wedged sundial marks the point at which each day in the United States begins.

A monument celebrating the idea of reaching inaccessible places.

Eccentric concrete mansion and museum designed and built by hand from the inside out.

A pride of the state, this working museum crafts pottery mosaics in the style of Pennsylvania's earliest European settlers.

A monumental statue of RCA's mascot now sits atop a historical society roof after a life of moving around.

A museum dedicated to exhibiting remarkable outsider art.

Crammed into a Baltimore row house is an oddities shop that sells everything from skulls to dead insects.

A daily replay of the experiment that proved the rotation of the Earth.

This elaborate towering structure was once famed for its revolutionary height.

Yo, Adrian!

A crumbling hospital from the 1850s on Roosevelt Island.

The actual model from the original "Star Trek" series is now on display at the National Air and Space Museum.

The first purpose-built art gallery in the United States is once again open as a center of craft arts.

Home to items never before seen by the public.

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

The 5.5-mile ring of steel posts around the Capitol Building is one of the largest (and most uniform) of its kind in the world.