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

This abandoned caretaker's apartment is one of 13 left in the New York Public Library system.

A good place to research the Freemasons, esoterica, occultism, and hermeticism.

A Manhattan Episcopal church with an eerie underground crypt.

New York City's only preserved family home from the 19th century.

Cryptic messages embedded in the New York City sidewalk.

A discreet little stairway on St. Nicholas Avenue leads to a quaint and unexpected cobblestone street of 19th century wooden rowhouses.

The oldest bibliophilia club in America, with exhibitions on historic books and graphic arts.

New York's oldest and possibly grandest keeper of books.

Unlock the secrets of the conjuring arts.

A treasure trove of artifacts, books, and artwork from the "golden age" of exploration.

Hidden inside one of the world's most well-visited zoos is a secret plaque promising eternal life.

A collection of haunted artifacts chronicles the career of the world's most famous paranormal investigators.

The intriguing personal collection of a professional demon-chaser.

An unrealized dream to wirelessly electrify the entire Earth.

A crumbling stone stable and carriage house are all that remain of a manse that was once filled with Egyptian artifacts.

The final resting place of New England's last "vampire."

One of the oldest used bookstores in the U.S. has been selling antiquarian treasures since 1825.

The only structure left with direct ties to the Salem witchcraft trials of 1692.

Beyond being incredibly fun, not much can be said about the Hole with certitude.

Entering this curiosity shop is like stepping into a mad scientist's lab.

Private collection of art inspired by cabinets of curiosity.

An emporium for the weird, creepy, rare, and just plain gross.

These old stone ruins in the Oregon wilderness were once bathrooms and are steeped in legends of murder.