Jack Cade's Cavern, also known as the Blackheath Caverns, is an underground cavern extending several hundred feet beneath Blackheath in southeast London, England, mostly under the lawn of Hollymount Close, northwest of the Heath and southwest of Greenwich Park. Rediscovered around 1780, it consists of several interconnected chambers between 6 and 11.5 feet high alongside a 27 foot well; its original entrance stood at Cavern Cottages near Trinity Church on Blackheath Hill until those buildings were destroyed in the Second World War.
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