The bullet-riddled wall from the St. Valentine's Day Massacre, bloodstains enhanced for your viewing pleasure.

This arid landscape was once a lush wetland. Today, it's a paleontological site filled with fossilized mammoths, sabertooth cats, and more.

This art gallery and oddities boutique bewitches visitors with a trove of occult trinkets and eccentric antiques, work by an ever-changing roster of underground artists, and classes in tarot and other mystic arts.

Try not to get slimed in Tribeca.

Manhattan's lighthouse, erected at the insistence of the unsinkable Molly Brown.

The world’s oldest and biggest bookstore stocking only mystery, crime fiction, espionage, and thrillers.

This collection started by a Cornell professor once held more than 600 human brain specimens, including the one that belonged to its founder.

A museum within a museum, devoted to history's most questionable medical devices.

The secret city built by the Manhattan Project.

Legend says this cave housed a 16th-century cannibal and his family of 48.

This shop for all your super spy needs hides an educational secret.

An enormous park-like oasis, full of famous Chicagoans' graves.

Deep in the Ocala National Forest, a lonesome 19th-century grave.

An unassuming corner inside downtown Orlando's library offers a whole new world of the park and its history.

Hundreds of skulls and bones at the largest skeleton museum in the country.

The only runway directly into the magic kingdom has been closed since 1972, but it still sings to you if you drive fast enough.

Loyal fans of one television's most famous painters still come to pay their respects.

This once-derelict building is now one of the most beautiful bookstores in the world.

This solitary monastery may hold the remains of Vlad the Impaler (but probably not).

Some call this eerie forest of crooked trees the "Bermuda Triangle of Romania."

The legendary cliffside castle of three-time Voivode of Wallachia, Vlad the Impaler.

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

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

The taxidermy remains of the first mammal ever cloned from an adult cell are on display in Edinburgh.