Even France's favorite aquatic son Jacques Cousteau, couldn't get to the bottom of it.

Former bridge turned into an observation tower.

A crumbling island fortress that seems to be covered in a field of stone crosses but is simply incomplete.

Longest canal tunnel in the world, abandoned in the 1960s.

"Drunken ship" sculpture memorializing the French poet in the city where he died.

This folk museum is devoted to small figurines of provincial village life.

A French library that makes sure its love of books is writ large... giant in fact.

When the rain falls, this drain system turns into a musical instrument.

700 iron sculptures crammed into a Mediterranean park.

A 20th-century picture show in 3-D.

Ruins of a late 1950s Polish ski jump ramp in the middle of the city.

A 26-foot shark sculpture—a statement about bombs—set off a municipal battle royale.

Home to the most complete dodo remains known - one head, and one foot.

This battery powered bell has been ringing since 1840 and is one of the worlds longest running science experiments.

Used as an example in one of the first dictionary entries for "museum" in 1706.

A theatre built to house the rowdy Oxford graduation ceremonies became the stage for a debate about God's existence.

The beams of the New College, Oxford dining hall come with an amazing story.

Sculpture of a legendary French dragon.

A unique underground structure dating back to the 1st century BC.

The mental institution where Van Gogh created some of his most famous work now allows guests to walk in the artist's footsteps.

Walk through living pictures and music in the Cathedral of Images.

From carts to cars, this leftover Roman bridge in France has managed to survive for centuries.

A private garden of sculptural eccentricities.