This off-limits room in the National Library of France is home to a system of pneumatic tubes, once used to bring books to readers.

This museum houses an imposing skeleton army comprised of creatures great and small.

This massive library holds what was once the largest book collection in the world.

A centuries-old complex of hand-dug stone chambers has sheltered locals in times of trouble.

Ancient man-made caves underneath small town Belgium.

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

One of the deepest indoor swimming pools in the world.

Only museum in the world devoted to bookbinding and book arts holds a permanent collection representing five centuries.

Lavish royal estate punctuated with heated greenhouses.

Theme park featuring miniature replicas of European monuments.

Christ's blood preserved in a Belgian town.