File:Historical Photograph Of Chamkaur Sahib.jpg
"This picture is of the 'Kachi Garhi' at Chamkaur Sahib - also known as 'Garhi Sahib' and 'Tilak Asthan' - the site commemorates a hugely significant event in Sikh History - it is here that Guru Sahib's utterance that one Sikh would fight a hundred and twenty five thousand (sava lakh) was realised - it is the scene of the Shaheedi (martydom) of the Older Sahibzadas, Baba Ajit singh Ji and Baba Jujhar Singh Ji, and Guru Sahibs Beloved Singhs. The popular image of Chamkaur Garhi is of large fort - however it was a kachi garhi - more like a strong house with thick walls and one secure entrance. It is known as 'Tilak asthan' as it is here that Guru Sahib accepted the Benti of the Panj Piare and left the 'garhi' - thereby conferring the 'Guru-ship' onto the Guru Panth - The Khalsa. This picture Shows the original 'Kachi Garhi' with the Gurdwara built by the Maharaja of Patiala, Karam Singh." (description taken from: link)
1) Flickr photostream of user akaal_singh, URL: https://www.flickr.com/photos/akaalsingh/ (initial upload)
2) https://twitter.com/moomjamma/status/1075698367798435840 (re-upload 1)
3) link (re-upload 2)