It is a HUGE, lengthy dark grey stone building with no ornamentation, but a sort of scallopped roofline on the EAST side of the river just across from the hiking/bike trail and that campgrounds that takes up a huge part of the riverbank up on the hilltop .............
I know it is NOT the Mills Mansion, Vanderbilt or FDR places......those are all on the WEST side and very well labeled on every single map that I have checked.....and also look like homes......this building just looks sort of imposing, old, and sort of creepy.
So your idea of some sort of monastery is a good one! When we got home I thought it would be so easy just to find out what it was because it is sooooooo imposing looking and impossible to miss when you look all along that entire stretch of the Hudson riverbank.............
Even looking for miles and miles across to that side of the river it is all you see, so I thought it would so easy to find out what it is.........now it's bugging me that noone knows what it is......Thanks for writing....somebody must know what it is though with all the boating activity and marina down at that area. Tons of local boaters were going past us the entire weekend......what's that saying 'curiosity killed the cat'? Meow
![EEK!](https://pics3.city-data.com/forum/images/smilies/eek.gif)