filming locations

The majority of the scences were filmed at Fort Worden State Park located in Port Townsend in Washington State. It became a state park in 1972 but was originally built between 1898-1908 (approx.) as a military defense base to protected the Strait of Juan deFuca (the body of water surrounding it)from possible enemy invasion which is the entry way to the major Port of Seattle and Puget Sound. It was used during World War I as well as World War II.
I'm assuming the "limestone columns" you mention is in reference to the training course scenes. Those are the old gun batteries where the huge guns were mounted to be fired to protect the Strait. The guns have long been taken away and scapped but all of the batteries are still there and there are quite a few of them. They are really cool too because they have all sorts of
corridors and passage ways that wind in and through them to explore.
The big white buildings were the barracks that the soldiers were housed in. Today they are rented out for conferences, wedding receptions, and overnight lodgings etc. If you want more info on Fort Worden you can google it and it will give more interesting info. Hope that helps.