France's most famous cemetery, with some of its most curious tombs.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

Tucked in the back of this amazing antique store is an important piece of medical history.

The mysterious image is believed to show Edward Hyde, 3rd Earl of Clarendon, in a beautiful blue dress.

This hidden oasis features a stunning view of the Hudson River and the Palisades from a castle-like museum.

You must take the A train... to the last active cemetery in Manhattan.

A famous songsmith's custom piano, dubbed "High Society," is hidden just out of sight in one of New York's finest hotels.

Historical figures from New York City's Catholic community reside in Midtown.

The oldest house in Manhattan is now a museum that remembers the home's sordid history of scandals, vice-presidents, and ghosts.

The original toys that inspired the beloved children's stories are on display at the New York Public Library.

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

Become a prohibition rebel.

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

Elevated freight railway turned wildly successful urban park.

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

This beautiful building in the heart of Manhattan's Financial District was empty for decades.

A crumbling hospital from the 1850s on Roosevelt Island.

A open air theatre built on a cliff by an eccentric British woman.

Grab a cuppa at England's first and only domestic tea plantation.

400-year-old garden, restored to beauty.

The final resting place of England's most notorious bandit.

Before becoming a poet John Keats studied here to become a surgeon.

This plaque in one of London's oldest public hospitals commemorates the first meeting of two of Britain's most famous literary heroes: Sherlock Holmes and Dr. Watson.

Preserved behind glass, the ruins of a medieval building used to store human remains.