Berthed at the Charlestown Navy Yard in Boston, "Old Ironsides" is the oldest commissioned warship still afloat.

Like stepping into a spooky fairy-tale, this shop carries the dark ideas of artists and other makers.

The 340-year-old house that inspired the classic Nathaniel Hawthorne novel.

The headquarters in Salem doubles as an occult art gallery.

A collection of full-size movie monsters opened to the public.

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

Now home to a drinking establishment, this building has a macabre history.

Come for the oysters, stay for the priceless art honoring inventors across history and Scotland's favorite outdoor sports.

This historic pub has maintained much of its 1906 decor, including a small sequestered room for women, where orders were slipped through a tiny window.

Near the former site of numerous witch burnings, this lavish Edinburgh mainstay pays homage to Scotland's brutal history.

One of the oldest scientific gardens in Britain, containing more than 13,302 plant species in its core collection.

The fountain marks the area where hundreds of accused witches were burned at the stake.

Ruined 11th century abbey built by King David I in Edinburgh, Scotland.

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

Exquisite wall sculptures carved in secret by an early quarryman in an obscure corner of the Paris Catacombs.

A favorite Paris bar for U.S. expats, including Gershwin, Hemingway, and James Bond.

Down a cobblestone alleyway is a museum dedicated to Romanticism, with a secret garden.

Egyptian Revival movie palace abandoned for decades and restored in 2013.

France's national museum of scientific and industrial instruments.

This whimsical castle of grottoes was the labor of love of a French postman, and one of the greatest achievements of outsider architecture.

A horde of stray cats rule in this secluded Parisian cemetery under a bridge.

One of the oldest medical collections in Europe focusing on rare surgical instruments.

The macabre collection of Jacques Sirgent, an expert scholar on the undead and all of their trappings.

This museum houses an imposing skeleton army comprised of creatures great and small.