What's old is new again
The upper image is the cruiser Olympia, launched in 1892 (commissioned in 1895) as U.S.S. Olympia (C-6). She currently lies in the Independence Seaport Museum in Philadelphia. The museum site says Olympia is the oldest steel warship still afloat!
The lower picture is the new super-duper stealthy guided missile destroyer U.S.S. Zumwalt (DDG-1000). Yeah, the one with all the problems, like the ammo-less main gun...
But what struck me is that the hull designed to let naval gunfire bounce off (it didn't work that well...) has been brought back to let radar beams bounce off (well, off and up, not off and back to the source).