Ratcheugh_Observatory
Ratcheugh Observatory is a late 18th-century folly on a prominent crag[lower-alpha 1] between Alnwick and Longhoughton in north Northumberland, England. Commissioned by Hugh Percy, 1st Duke of Northumberland, the castellated Observatory incorporates a viewing tower with prospects of Alnwick and its castle, and of the North Sea coast at Boulmer.