C.D.Friedrich, A Wreck in the Ice-sea, 1798.
A photograph of an iceberg by Olaf Otto Becker; a much better image here with several other amazing pictures of icebergs. Wonderful light effects.
Dunmore and Critcherson, 1873; they went to the Arctic with the painter William Bradford and published a fine book of phorographs. More information here, with a few pictures:
Another of Becker's photographs.