This installation was planned to have a 16" gun that could shoot a 2,200 pound shell 27 miles. The gun weighed 1,000,000 pounds. The site was rendered obsolete as it was reconsidered to be vulnerable to aircraft attack, so it was never installed.
Man, you had the right lens for this shot. When I was here my 24-120 was not near wide enough to capture this. That 1.6 multiplier can work against you sometimes.