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A network of walks from three points on the River Thames, including the Woolwich Flood Barrier, to Crystal Palace Park, linking together the open spaces of SE London.
Website: Link
See also Link

The Capital Ring is a surprisingly green route that encircles London. Distance is 78miles; it threads together parks and open spaces, mostly following pleasant residential roads in between. The route is an initiative of the London Walking Forum. The route is very well signed, with a Big Ben logo TQ1678 : Three walk logos, Gallows Bridge. The route is a walker’s equivalent of the North and South Circular roads. Link

The common was historically a place for the common people to graze their livestock, collect firewood and so on. But from the 18th century it was used by the military, and the Board of Ordnance acquired all the rights to the common in 1812. Nevertheless it remains a de-facto open space. In 2012 it was used for the shooting events of the London Olympics.

A detailed history is given on the English Heritage website at Link