The Freeport Township of Flotsam is one of the best Steampunk inspired sims I have visited in a while.
Cap'n Nemo's Underwater Observatory is one of several attractions available in the town. Cap'n Nemos's reminds me of a Walt Disney attraction combined with a touch of “Yellow Submarine” 60′s Beatles Psychedelia. The steampunk-inspired controls and lights and contraptions are reminiscent of a Jules Verne science fiction novel. There is much to explore and marvel at.
I reviewed the above-water town here yesterday. This SLurl will take you to both locations. I highly recommend a visit.
To see my review of the above-water town: