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

This life-size replica of the Statue of Liberty's flame is also a tribute to Princess Diana by default.

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

This historical Netherlands fortress still bears the marks of its single siege.

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

This sprawling Belgian fort was once thought of as impenetrable but now it is simply an abandoned relic.

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

For the holidays, the tallest broadcasting tower in the Netherlands turns into one of the world's tallest Christmas trees.

This centuries-old gothic monster has been converted into a sprawling, glossy bookstore.