United States aircraft carriers, to be exact.
When I went down to the airport yesterday to see about volunteering at the USO, I took the opportunity to document a somewhat unusual sight: 25% of the U.S. aircraft carrier power (IIRC) in my backyard.
From left to right, that's NIMITZ, REAGAN and STENNIS moored in the San Diego Harbor. Check out the sailing ship in the right foreground for a size comparison.