Cretaquarium - Thalassocosmos is one of the most important aquariums in Europe. It started its operation in December 2005 in the former American Base of Gournes and immediately became a pole of attraction for thousands of visitors.

Thalassocosmos was an idea and is maintained by the Greek Centre for Marine Research located next to it.

Visitors can wander through the long corridors of the aquarium, observe with microscopes and readinformational texts accompanying the sixty tanks with 2500 species of marine life. In the tanks, visitors will see a variety of marine life from big sharks to seahorses and jellyfish.