'Mysterious' black door appears on Sonning BridgeThis video can not be playedTo play this video you need to enable JavaScript in your browser.'Mysterious' black door appears on Sonning BridgeCloseA black door has been placed on a buttress of the Sonning Bridge in Berkshire.SubsectionBerkshirePublished22 August 2016Shareclose panelShare pageCopy linkAbout sharingRead description