Marqus R.
Yelp
Located on Darling Harbor, federally funded, designed by Philip Cox and being the only such museum having a foreign funded gallery, that by the United States of America, is beautiful, immense and massive not only in form but in informative detail. It's a definite must see and as a tip, plan on spending a solid full afternoon if not a full day. It's really that big and takes that much time, but your time will be well spent. With the possible exception of Museo Naval de Madrid it's the most complete maritime museum I've seen.
It has three in the water museum ships - the HM Bark Endeavour Replica, being the ship of Captain Cook which has docents eager and willing to explain every detail of the ship, its voyages and historical importance, the destroyer HMAS Vampire, and the submarine HMAS Onslow, also open to the public viewing, while smaller historical vessels also berthed water can be seen but not boarded.
The inside of the museum is full of displays including entire ships along with all sorts of maritime artifacts. The displays are not only artfully, eye appealing in their presentation, but some are delightfully whimsical and humorous such as, and my favorite, a sailing ship built entirely of beer cans.