The sign at the garden gate reads: "These Plants Can Kill."

The curiosities and wonders of pharmacy in a delightful historic building.

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

An antiquated German apothecary on Chicago's North Side.

Bordered by forest on three sides and the ocean on the other, the Great Dune of Pilat is the highest sand dune in Europe.

This futuristic observatory at the top of the Pyrénées offers unrivaled views.

Devastated landscape used for hundreds of years by the Romans as their primary mining site.

The final resting place of the great navigator, or maybe his brother.

Venice's island of the dead.

Skulls from the plague of 1656 and World War II bombings are united by a cult dedicated to caring for the ancient dead.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

Putrefaction plateaus in Iran, where the dead were sent for decontamination before going to their final resting place.

An ossuary built in 1210 to collect bones from the Ospedale Maggiore of Milan.

A house of bones — but nobody is quite sure to whom they belong.

A counter-culture bookstore like no other hides in plain sight in the streets of Paris.

A morbid secret lies hidden within the beautiful walls of the Boston Athenaeum.

Radical Bookstore and Community Space.

A picture-perfect town, perfect for blowing up.

An ancient monastery, a locked room, and a mysterious book heist.

A house built from trash known as the poor man's Hearst Castle.

A "gravitational anomaly" located in the redwood forests just outside of Santa Cruz, California.

This quirky roadside attraction dives into the many theories surrounding North America's most infamous hairy cryptid.

Home to the "Circus" trees created by Axel Erlandson.

Two rocks in a perpetual kiss and one of "the most romantic spot in America."