Jack Cade's Cavern

Jack Cade's Cavern[1][2] is a cavern, extending several hundred feet underground, in Blackheath, south-east London, England.

It is located northwest of the Heath and southwest of Greenwich Park, mostly beneath the lawn of Hollymount Close.

[4] The entrance was at the end of a row of small cottages called "Cavern Cottages" at the rear of Trinity Church on Blackheath Hill,[5] (destroyed in WWII).

Entered by a flight of forty steps,[6] it consisted of three or more separate caverns joined to one another by tunnels.

The first or main cavern is roughly circular and about 35 ft (11 m) in diameter.