Derelict building in London Park, surrounded by trees and marshland

derelict wanstead park the grotto ruined buildings ruins old decay damage wreck archeological relic structure the grotto in wanstead listed building folly architecture remains building ruins in wanstead park moss covered ruins british history stone stone work deserted despoliation neglect wanstead estate ivy growth on buildings falling down old buildings parks in london wanstead grotto grotto wanstead history fly over sad grey overcast bricks repair 17th century aerial drone 4k wanstead arches arched windows panning left