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

Many of Edinburgh's more unsavory characters spent their final days behind this door while awaiting their executions.

These steps offer a breathtaking view of one of Europe's most besieged fortresses.

Once home to a Scottish baronet, this 18th-century historic house doubles as a legendary art space.

The massive, incredibly rare instrument is over 11 feet tall with a range so deep it goes lower than humans can hear.

The enormous 250-room Vanderbilt mansion conceals hidden doors and secret passageways.

Nature took her revenge on the "Wickedest City in the World."

Gladiators battle and chariots race daily in the ruins of a once-great Roman city.

Mysterious 500-year-old tapestries depict a unicorn hunt.

This centuries-old hotel hides a network of secret cellars and passages once used by smugglers.

Tiny effigies of the victims of Edinburgh's famous Anatomy Murders.

This once bustling boomtown hotel is now the hottest spot in Nevada for ghost hunters.

The first rural cemetery west of the Mississippi is home to the elaborate tombs of St. Louis' local beer barons.

Charleston's historic city jail once held everyone from pirates to Civil War POWs.

The real-life site of Ichabod Crane's infamous gourd attack.

A museum and shop on Bourbon Street located in the former home of the second Voodoo Queen of New Orleans.

The only rotating bar in New Orleans has been slowly spinning since 1949.

One of Frank Lloyd Wright's greatest—and favorite—architectural masterpieces was almost lost.

An ancient ossuary in Rouen.

His "Lionheart" is entombed separately from the rest of his body.

This medieval tower is all that remains of the castle where Joan of Arc was held before being burned at the stake.

A former copper mine which became a truly unsuccessful prison.

The body of an unidentified woman, visible through a glass coffin, was discovered by accident.

In a largely deserted ghost town, a little brick building recalls its history as a gold rush hub and haven for outlaws.