Monterey Bay Aquarium is one of the best-designed aquariums in the country. A rather stand-out feature of this aquarium is the two-story tank, home to a kelp forest in which one can find sunfish, sharks, and the occasional diver tasked with squeegeeing the algae off the tank walls. Sand dabs are displayed in shelf-like tanks ideally suited to the flat fish, and a school of sardines swim in an endless circle in their cylindrical tank home. If you want to interact with some aquatic dwellers, you're invited to pet the bat rays. The jellyfish display is one of Monterey Bay Aquarium's star attractions.