Ancestry has provided an index to a collection of images of ships that transported immigrants to the Port of New York from 1851-1891. The images available have been obtained from the Mystic Seaport museum.
Ancestry.com. New York Port, Ship Images, 1851-1891 [database online]. Provo, Utah: MyFamily.com, Inc., 2004. Original data: Ship images obtained from and reproduced courtesy of Mystic Seaport.
This database is an index to images (photographs and artistic renderings) of some of the ships that arrived from foreign ports at the port of New York from 1851-1891.
What makes this useful is that the images are also connected to an index of the passengers arriving on these ships. Thus, if you are looking for an image of a ship that a particular person travelled on, you don't have to search this database already knowing the ship's name. Instead, you can search by name and be linked to an image of the ship. You can also browse this database and look directly at the ship images, which are sorted by arrival date.
According to Ancestry.com: