It is a great exhibition of the Bay. It was built in 1957 to help model any project design changes in the bay. (Now computers do the work this was intended to do.) It takes about an hour or so to take in, but it is worth the time spent. It presents a visual of the entire Bay from the Pacific to South Bay--San Jose--to San Pablo Bay to Suison Bay to Sacramento / San Joaquin River Delta. There are demonstrations of where the water comes from in the Sierra Mountains and its journey through the Bay. It's really not for kids younger than Junior High--but certainly suitable for High School kids. The really important part here to understand is that is is an appropriately scaled model of the Bay in order to get an accurate reflection of what happens if certain changes occur in the Bay so the model is a technological marvel as well. There are signs along the way to show the visitor where they are in relation to the model, bridges are labeled, and significant areas are labeled. It is well worth a look see.