A carriageway provided a route to Ratcheugh Observatory. This is a gazebo and eyecatcher built in gothick style around 1754–1770 to designs by Robert Adam for Hugh, the first Duke of Northumberland. It incorporats a small cottage, which was added around 1850. From a high posaition on Ratcheugh Crag there are views of the Duke’s possessions around Alnwick Castle, Hulne Park, and Hulne Priory. More distant landmarks include Dunstanburgh and Warkworth Castles and the Farne Islands.