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

There are plenty of wonderful panoramic vistas in Edinburgh, but not many are hidden smack in the middle of the Old Town.

This series of Scottish caves has no clear purpose other than baffling historians.

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

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

A 18th century graveyard and its astonishing cortege of macabre iconography.

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.

There’s a secret bunker inside the Brooklyn Bridge, but the city won’t say where.

Have a steam and some blini at this cafe in a century-old bathhouse.

In the middle of downtown Brooklyn lies a 165 year old secret hidden right below the surface (closed to the public indefinitely).

A whimsical, but often overlooked clock in Park Avenue.

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

This neighborhood grocery houses a treasure trove of Eastern European delights.

This otherwise innocuous bodega was once the headquarters of the most feared assassin's guild in American history.

An artist's cute bronze subway sculptures belie his violent artistic past.

Blighted Irish field and the ruins of a 19th-century cottage on the edge of urban Manhattan.

Deep under Manhattan is the largest construction project in city history. So far, the project has taken the lives of 23 workers, or "a man a mile."

An oasis of calm amid the chaos of the boardwalk, the museum traces the heritage of this beloved beachside amusement park.

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

A bit of retro transportation flair preserved in the world's largest department store.

A dark, dank room in subterranean Manhattan was the site of a ghastly murder.