The mummified relic of St. Antoninus.

Art and armour fill every inch of this rich kid's Italian villa.

Renaissance hospital featuring a rotating door into which unwanted babies were dropped.

Secret refuge and museum of the Duke of Florence.

Over 50 exquisite hand-painted Renaissance maps decorate a Medici storage room.

A large grotto built in the 16th century amidst Florence's famous Boboli gardens.

The oldest operating pharmacy in the world features 800-year-old recipes.

The middle finger of modernity.

Its 27 graveyards represent the many nationalities and ethnic groups that voyaged to this wilderness in the late 19th century.

Remnants of a forgotten 1920s speakeasy and Prohibition-era murals were discovered in its basement.

A tribute to the Nirvana frontman hides beneath the bridge that was the singer's beloved hangout spot.

An abandoned 19th-century hospital now swirling in ghost stories.

"The Reptile Man's" very own roadside zoo features an albino alligator.

City Council meetings still happen in this historic building, impeccably preserved on the inside.

A tiny plaque hidden miles into the Washington wilderness is all that remains to honor a shipwreck that left 18 people dead.

Protected from the elements, these Native American rock paintings have survived approximately 250 years.

The gravestones in this lost burial ground were bulldozed and replaced with houses and a dog park.

Stones speckled along Harris Avenue reveal hidden nuggets of the past.

An allegedly haunted mansion with a tragic, tawdry past.

The building features one of the last remaining free-floating spiral grand staircases in the U.S.

A 1940s nuclear reactor built to produce plutonium for the Manhattan Project.

Seattle’s Whimsical Mural Master.

This monument remembers the first Japanese Americans forcibly relocated during World War II.

A library of only unpublished manuscripts.