Castle Zhestal
One of the ruins up in the Mountains of Death.
map of castle and nearby area
zoomed in map of castle to show details.
walls 12 feet thick, 2 pourtcullis block entrance at the orange area. They look newly installed. This is the entrance to this old castle. Looking through the pourtculls, visitors might notice one of the metal ladders going up to the top of the wall. There are between the debris pile and the wall to the left of the debris.
Note that wood/metal gates for castle wall entrances came later on in my campaign. They cost more than a portcullis to make.