At the Nausicaá in Boulogne-sur-Mer, you can observe underwater worlds without getting wet. This aquarium on the coast of northern France is the biggest in Europe.

© Jonathan Alexandre

Hammerhead sharks, manta rays and clownfish are just some of the 58 000 or so marine animals to be seen at the ­Nausicaá since May. In addition to the existing exhi­bition, Mankind and Shores (a journey from the North Sea to the coasts of California and into the Tropics), the aquarium has opened a giant pool (60 by 35 meters) with an enormous glass front. It replicates the underwater world around Malpelo Island, off the coast of Colombia, in part as an impressive reminder that we must take better care of our marine ecosystem.