After walking through the tunnel, you arrive at one of the gun placements. This was to be the mounting place for one of the two 16 inch guns.
We then walked up the hill to the mountaintop above the bunker. The views are stunning.
There are also lookouts and more placements for smaller guns.
You can see down to the parking area. It was full the entire time we were there with many waiting for a space.
Some of the fortress is underground and not accessible to the public, but there is still lots to see. Here's an old plan showing some of the under ground area you can not access. Though, the main large tunnels to the guns are open.