Ratcheugh Observatory is a late 18th-century folly on a prominent crag[a] 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.
- ^ Heslop, Richard Oliver (1894). Northumberland Words.
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