In Williamstown proper, the industrial Seaworks precinct comprises historic boatsheds, a maritime museum and exhibition space. It's also the headquarters for Sea Shepherd Australia , and on weekends you can tour their anti-poaching vessels from noon to 4.30pm (when they're out to sea tackling Japanese whalers, it's still worth dropping by for displays and video about their anti-whaling campaign). Seaworks also has a shipbuilding yard, a pirate-themed tavern and Victoria's oldest morgue, which you can visit on a ghost tour .
