This bike path traverses the treetops.

The Belgian royal family's private depot now stands abandoned and forgotten alongside the tracks.

Because sometimes you need to make a batch of frites even when the stores are all closed.

An underground city of ancient quarry tunnels hid thousands of Allied soldiers in WWI.

The final resting place of the poets Shelley and Keats.

Sitting on an Italian hilltop is this surreal fortress built by the mad inventor of electrohomeopathy.

Rome's semi-secret peephole vista is also a former Crusader stronghold.

The busy transport hub is home to the tallest airport slide in the world.

Frozen in Norway, vended in Singapore.

The highest pedestrian bridge in Singapore looks like a series of undulating waves rising between two public parks.

The final resting place of 19th-century sailors previously banned from being buried within Portuguese Macau.

Teeming with illegal goods and services, this towering maze of vice is also a popular tourist accommodation.

The world's first and only museum dedicated to dachshunds.

Ride a dragon train into a world of dwarves.

Final resting place of the most prolific Fijian cannibal of all time.

Largest Buddha carved from gemstone-quality jade in the world, on a world tour through 2011.

A forest full of mystical fantasy figures, nearly destroyed by recent fires.

Woven tree art gives this towering Australian woodland a touch of mystical whimsy.

A bike train runs along a disused railway line through the tranquil French countryside.

Now an entertainment complex, the Lingotto building was once an avant-garde auto factory with a test track on the roof.

An abandoned train station in Munich constructed for the 1972 Olympic games.

A subterranean display of public art and architecture.

The patron saint of spinsters grasps a container of dried blood.

This monumental work of art symbolizes the coming together of a previously divided city.