High winds can make this one scary landing.

A marvel of Byzantine engineering under the streets of Istanbul.

Copenhagen's celebrated theme park and gardens.

This massive underground salt mine now holds a sci-fi theme park in its depths.

Moss and stone turn this waterfall into an otherworldly liquid veil.

A muddy alien landscape that is home to rare species of exotic plants.

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

The European towns of Brașov and Râșnov each have proud signs reminiscent of the Hollywood sign.

This Romanian village may have been drowned, but it is long from forgotten.

The possible imprisonment of Vlad the Impaler here earned the medieval castle its nickname, "Dracula's Castle."

The gorgeous entrances into the city's underbelly look more like grand halls than subway stops.

One of the world's tallest statues is also one of its most hated.

The avant-garde design was able to bypass strict Soviet regulations on architecture.

World's largest bell sits on the grounds of the Kremlin in Moscow.

There's an exclusive Beefeaters pub hidden in the Tower of London.

Black cat statues guard this temple-like Egyptian revival factory.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

The curios of pharmacist and collector Henry Wellcome.

A 300-year-old tea shop that brought tea to the English people, not to mention the Queen herself.

An unusual round church in London with a Templar past.

The anatomical-pathological collection of a man who changed surgery.

A collection of comics, graphic novels, animation and caricatures devoted to exploring this often overlooked art form.

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