The maritime museum of Lisbon is located in a wing of the Jeronimos Monastry, close to the Belem Tower. It is a major tourist attraction. It holds a large and fine collection of items focusing on the age of discovery (16th century maps, astrolabes, paintings, ship models) and ceremonial barges. When we were there in September 2010 I was most impressed by the many elegant, richly decorated barges.
Photos of some barges
I show a few photos of the Royal Barge (Bergantim Real) and two other barges. If you click on a picture you will get the high resolution image.
I show some photos of a contemporary 19th century frigate model. The model has been used for officers' training at the naval college. Click on the pictures!
Unfortunately, most of the museum's objects are kept behind poor glas
in display cases. The glas gives much light reflection and makes it
somewhat difficult to get a clear picture or shoot a photo. Despite of
that the museum is absolutely worth a visit.
There is some more information on the maritime museum in a tourist information website.