Catacombs turned marketplace.

A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

The curios of pharmacist and collector Henry Wellcome.

The only university zoological museum in London houses extinct animals, bizarre natural history specimens, and a Micrarium of microscopic creatures.

This London pub hides a peculiar secret: a recreation of the rooms shared at 221b Baker Street by Sherlock Holmes and Dr. Watson.

The perfectly preserved underground rooms where Churchill plotted the war against Germany.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

This museum is rotten with a century of wax medical deformities.

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

This meticulously extracted nervous system allegedly came from a 19th-century custodian who donated her body to science.

Crypt mausoleum in cathedral's basement contains relics of third century Roman martyr, Saint Vibiana.

During prohibition, corrupt city officials ran drinking dens under the streets of Downtown Los Angeles.

A look into the Church of Scientology's deeply unfavorable view of psychiatry.

Medical and zoological curiosities for sale.

A modern day curiosity cabinet.

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