This eye-popping Icelandic crater lake is surrounded by red volcanic rock.

The curios of pharmacist and collector Henry Wellcome.

Weird wax anatomical models reside here, as do other anatomical specimens.

A collection of 20th-century automata, penny arcade games, and musical contraptions.

The vast chamber inside this abandoned cooling tower looks like something out of a sci-fi dystopia.

Where beautiful signs live on forever.

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

This unique structure in suburban Austin is made up entirely of other people's castaways, and constantly changing.

A curious collection dedicated to human and animal anatomy and pathology.

This volcanic cave lake is essentially hard proof that Iceland is the most magical place on Earth.

Elevated freight railway turned wildly successful urban park.

Continuing the tradition of the dime museum in style.

A museum devoted to bringing to light forgotten or neglected histories through exhibitions, education and public programming.

This shop and gallery is a modern-day cabinet of curiosities, unassumingly positioned along an urban thoroughfare.

A 100-year-old purveyor of curiosities, curios, and kitsch featuring mummies, shrunken heads, and a Fiji Mermaid.

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

An enormous, inside-out glass globe built in 1935.

This Boston medical museum features the skull of the famous medical case of Phineas Gage.

A trash dump made beautiful by nature's power.

An ancient capital city that dates back 3,000 years old and harbors many surprises.

A church of bones, decorated with 40,000 human skeletons.

An emerald-green grotto just a short trip from Austin.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

The vast, legendary catacombs hold secrets much stranger than stacked bones.