Some ruins in the Outward Bound Manitou Point Preserve in Garrison, NY.
“Northgate” is the name of the Edward J. Cornish estate on Mount Taurus in Cold Spring, NY (Hudson Highlands State Park). Occasionally groups of people — with permission from NYS Office of Parks, Recreation and Historic Preservation — will go to the estate and clean off some of the vines (but not all).
Map: Area of estate on Bing Maps
Link: More information
Franny Reese State Park is located in Highland, Ulster County, NY. According to the Franny Reese State Park Master Plan and Environmental Assessment dated December 2008, “Ruins of at least seven former structures and historic buildings were identified on-site including two cistern buildings, a main residence or hall, several outbuildings, stone cottage, and a windmill. Each structure exhibited varying levels of deterioration, and some are collapsed. The windmill, though still standing, appears unstable and its structural stability appears to be significantly deteriorated. However, despite deterioration, these cultural resources add inherent value to the property as remnants of past human occupation and land use.”
Link: Map and information about the park
Bannerman Castle is located on Pollepel Island in the Hudson River across from Fishkill, NY. The “castle” was a storage building for surplus ammunition, uniforms, and the like until sold, which was the business of the Bannermans. The island contains more than just the “castle” — it was also the summer residence of the Bannermans. The island is now part of the Hudson Highlands State Park. “Hard hat” tours are run on the island, including a boat ride out to the island.
Link: About Bannerman Castle