Drove down by the third pic last year on a visit to the museum. Big McMansion there with a lot of private-keep out posters. I always wished I could hunt Constitution Island just off the point but it is uber verboten. Back before 9/11 one could walk up the RR tracks from the Point and climb the hill north of the main area, and there are many early artillery shells and balls in the woods because the West Point Foundry across the river test fired all the cannons they made over the river and onto the side of the mountain. They also test fired captured Confederate cannons and projectiles at the mountain and many rare projectiles have been found up there. I know a guy who took days to get a 300lb Parrot solid shot down off the mountain. I was up there, and there were chunks of large round shells just lying on the rocks (very rocky terrain) but finding whole ones was tough. Hard hunting with BFOs then since many of the rocks are good quality iron ore and signal off like a cannon ball. Probably one could still find some balls in the Hudson below the mountain by diving, but people are no longer allowed on the hill. There have been a bunch of artillery rounds found in the river a couple miles south off Bannerman's Island. There were five Rev war forts in my county, but two have been developed over and the other three are naturally off limits as historic sites.
Jeff you ought to get back up to the Point again, the museum there is always a good visit, and you can still go and walk around the grounds but you need photo ID to get into the grounds these days.