Rules of the thread. You can pick only one ship and ONE SHIP ONLY per era. You need to accompany your ship with a picture and a short commentary why you think it's beautiful.
There will be three era's.
prehistoric-1904
1904-1945 (dreadnought era)
1945-today (modern ships)
My two candidates are

IJN Yamato. The slightly swept back lines, the sloping foredeck and the compact superstructure all add up to a very beautiful package.
and

The Sovremenny class destroyers. Mostly because the very sleek hull lines with the very overcrowded superstructure and those massive sunburn tubes on the sides.