This gorgeous reading room houses the oldest and largest art history library in the Netherlands.

Tintin's creator is celebrated in an immersive museum that's an astounding work of modern art.

This small window display is dedicated to the noble carrot.

Most prolific publishing house in the 1600s open to the public.

This giant urban staircase was built to keep the city's brave fighting men from getting waylaid in the red light district.

This narrow Ghent alleyway is an officially sanctioned street art tunnel.

This bike path traverses the treetops.

This bike path was sunk below water level for maximum wonder.

A wonderfully kitsch bookstore the size of a supermarket.

This abandoned Belgian fortress is purposefully being left to nature.

A magical and peaceful ruined Cistercian abbey in what is now southern Belgium.

This collection of over 50 murals celebrates Brussels' rich history as the self-proclaimed home of the "comic strip."

This fairytale castle was built as a show of power but was nearly torn down thanks to its history of torture.

Lavish royal estate punctuated with heated greenhouses.

Part modern art project, part traditional chapel, this see-through church is only substantial from the right angle.

It was meant to help transport wounded soldiers to a secret underground hospital.

A plaque marks the house in Stockholm where the French philosopher René Descartes lived up until his death.

"Only the dead get off at Kymlinge."

Now a hotel, this former bank was the site of a robbery that spawned a psychological phenomenon.

It houses the remains of a 17th-century version of the Titanic.

The library's graceful rotunda is like a bibliophile's temple.

A sixth-century Byzantine cistern hidden below a modern carpet store.

This museum was invented in a novel before being made real by the author.

Step back in time and witness the fall of Constantinople.