Since opening in 1969, New England Aquarium, a waterfront landmark has become one of Boston's biggest tourist attractions. The most famous exhibit, the massive 200,000-gallon "Giant Ocean Tank," has a simulated Caribbean coral reef in which sharks, sea turtles, moray eels and tropical fish cruise by crowds of children pressed against the glass. Other marine galleries contain piranha, sea otters and three species of penguins. As if all that were not enough, the aquarium also offers whale watching cruises, seal shows, and its very own IMAX Theatre.