This "floating railway" is one of the world's oldest monorail systems.

Museum deep in the catacombs of St. Michael the Archangel Church is explored by touch, sound, and smell.

The world's first and only three-segment bascule bridge folds up into the shape of a capital "N" to let boat traffic through.

One of the last remaining railway viaducts equipped with a transporter ferry.

These crumbling Nazi artillery bunkers are now fair game for massive graffiti projects.

A rare example of World War I trenches from the British front.

In the shadow of a former battleground, the resting place for nearly 2,000 soldiers who died in World War I.

A clear blue swimming hole with hidden caves, still unexplored.