This enchanting 600-year-old tree is so magical it inspired the beloved tale of Pinocchio.

An Italian hillside ghost town.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

A castle built by an eccentric medieval enthusiast in rural Ohio.

The tragic reality of a town riddled with rumors of haunts, chemical spills, and serial killers.

A single handprint, which, according to Ohio State University legend, cannot be scrubbed off.

This abandoned bridge to nowhere stands secluded in the woods of a Cleveland suburb.

An elegant sandstone stairway built by the WPA still connects two neighborhoods in Akron.

The oldest brick house in the state of Ohio.

The oldest house in Washington, D.C. wasn't originally constructed in the nation's capital.

A muscular Art Deco monument represents the struggle between regulators and unbridled markets.

A clone of a cloned tree that was so important it allegedly had its own guards.

A computer bug so primitive it was an actual insect.

The oldest building in the District of Columbia was preserved because of a mistaken connection to George Washington.

Obscure Freemasons still live in D.C.’s largest private residence.

This imposing Masonic temple a mile from the White House was the first public library in Washington, D.C.

This leafy estate is worth $18 million and is so grand it has two mailing addresses.

Enormous piles of historically significant stones, dumped by Congress in a forest, and abandoned for 60 years.

In 1911 this intersection was called "the heaviest corner in the South," and outlandish claim that only grew wilder over the years.

These ruins are all that's left of the former Alabama State Capitol.

The highest point in Alabama was almost completely deforested, but is now home to protected towers and trees.

This natural wonder drops 16 stories straight down through rare flora and streaming waterfalls.

A favorite of Amelia Earhart, ranking among those rare bridges that can be crossed without changing sides of the river.