The graveyard holding the remains of George Washington's slaves was forgotten for nearly 200 years.

Fresh wooden posts have been added to ancient holes to recreate a primitive henge clock.

A 400-foot-tall tall map of Chicago makes this once-ignored building stand out.

First planned industrial community in the United States.

This modern castle sat empty for decades before a fire inspired its builders to complete its luxury halls.

The world's longest known cave system.

The farm where one of America's greatest leaders was raised is now a well-appointed landmark.

Walk in the footsteps of the famed astronaut at Purdue University.

Detroit’s downtown castle is one of the oldest structures in the city.

A small mountain made entirely of banded iron stone overlooking downtown Ishpeming.

This beloved roadside attraction welcomes visitors with his signature neon smile.

The most magnificent bottle house in a town strangely full of them.

Twelve plaster figures inspired by da Vinci's famed painting haunt the desert landscape above a real-life ghost town.

Water of undetermined depth has attracted rare fish and cult leaders alike.

Odd outsider art installations surround a Gold Rush-era ghost town.

A massive hydrovolcanic explosion left a half-mile wide crater in Death Valley.

The tragedy of the Japanese internment camps is remembered here by a stark "Soul Consoling Tower."

An abandoned Jazz Age dream home and con man's hideout in Death Valley.

Millions of years of oxidation make a drive down this winding Death Valley road surprisingly colorful.

The lowest point in North America is home to an undrinkable pool surrounded by fields of geometric salt flats.

A morbid piece of memorabilia from the most famous shipwreck in current history is just one of the many poignant artifacts in this Canadian museum's collection.

Hunt for buried treasure in Nova Scotia.

Two hundred tons of pioneer artifacts were painstakingly recovered from a shipwreck at the bottom of the Missouri River.

Knoxville’s architectural icon was the symbol of the 1982 World’s Fair, even catching the googly eye of Bart Simpson.