The Steampunk movement manifests itself in many ways. Already Jules Verne wrote of a floating city crossing the oceans. Some modern-day enthusiasts have tried something similar, but on a far more modest scale. The Messy Nessy blog writes a long piece about their maritime endeavor in Venice in 2009: The Swimming Cities of Serenissima (link >>>).
There is a great collection of HD photos from that event by Todd Seelie here >>>