This hidden green space is the city's second largest conservatory.

Following the trail of an old metro line, this scenic path is haunted by a creepy spriggan statue.

A makeshift shrine to the late rock star is still kept up on the nondescript façade outside 1 Logan Place.

A 1,215-foot tunnel transports pedestrians beneath the River Thames.

An easily overlooked stretch of ornate window fronts and gaslight lamps that could be right from the pages of Dickens.

Winding paths and ramshackle mausoleums in the oldest "park cemetery" in London.

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.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

An elevator into the Baltic Sea.

No need to strap in for a "ride" on this walkable roller coaster.

A sprawling Baroque park with 300-year-old hydro-pneumatic waterworks.

Travel deep inside of Europe's second largest glacier in the world's largest man-made ice cave.

An isolated, rusty phone booth commemorates Iceland's first international telegraph cable.

This volcanic cave lake is essentially hard proof that Iceland is the most magical place on Earth.

A Jenga-style cylindrical tower of books that appears to go on forever.

A gorgeous stone viaduct crosses over a bucolic valley.

Climb around the high waterfalls on series of iron ladders and bridges within the wildest gorge in the Slovak Paradise.

This former quarry is now a picturesque gorge that hides a sunken lake.

This conical hill was built as a testing ground for an engineer known as the Glider King.

Someone loved this song enough to carve all of its lyrics onto a tree trunk in a Berlin park.

This Berlin island is home to a flock of free-roaming peacocks, as well as a historic ivory folly.