The hand operated cranes were originally designed for and used by the stone industry of Portland. After quarrying ceased in the area the cranes were mainly used by the local fisherman to lower their boats into the sea. The steel cranes you see today are later replacements for the original wooden cranes. Although still used until a few years ago when I recall seeing a fishing boat lifted out of the sea onto the bill today the cranes are scheduled monuments and appear no longer used.
Portland Lighthouse from here it is just a short walk to the boat cranes
Another circular type 25 WW2 pillbox in Dorset this one on the Fleet near Weymouth. This one is in better condition than the one in my other post which was at Kimmeridge bay.
Portland Tout Quarry Sculpture park is set in an old stone quarry on Portland. There are over 50 sculptures that are set in an area rich in nature. The quarry is tucked away in a small industrial park with limited parking but well worth a visit.