Watercolors of Windsor Castle and other royal residences back before Victoria and Albert lived there by English watercolorist Charles Wild. Living from 1781 to 1835, he specialized in painting architecture and exhibited at the Royal Academy.

Frogmore_House,_Green_Pavilion,_by_Charles_Wild,_1817_-_royal_coll_922121_257043_ORI_0_0
“Green Pavilion, Frogmore House.” 1817. Watercolor with touches of bodycolor over pencil with an engraved aquatint version published as plate 29 of W.H. Pyne’s 1819 work “The History of the Royal Residences.” Royal Collection Trust. In the public domain in the United States because the artist died over 70 years ago. via https://commons.wikimedia.org/wiki/File:Frogmore_House,_Green_Pavilion,_by_Charles_Wild,_1817_-_royal_coll_922121_257043_ORI_0_0.jpg
"Queen's Presence Chamber, Windsor Castle." 1817.
“Queen’s Presence Chamber, Windsor Castle.” 1817. English. Watercolor with touches of bodycolor over pencil with an engraved aquatint version published as plate 7 of W.H. Pyne’s 1819 work “The History of the Royal Residences.” Royal Collection Trust. In the public domain in the United States because the artist died over 70 years ago. via https://commons.wikimedia.org/wiki/File:Windsor_Castle,_Queen%27s_Presence_Chamber,_by_Charles_Wild,_1817_-_royal_coll_922099_257019_ORI_0.jpg
Hampton_Court_Palace,_Chapel,_by_Charles_Wild,_1819_-_royal_coll_922125_313698_ORI_2
“Chapel, Hampton Court Palace.” 1819. Watercolor with touches of bodycolor over pencil with an engraved aquatint version published as plate 33 of W.H. Pyne’s 1819 work “The History of the Royal Residences.” Royal Collection Trust. In the public domain in the United States because the artist died over 70 years ago. via https://commons.wikimedia.org/wiki/File:Hampton_Court_Palace,_Chapel,_by_Charles_Wild,_1819_-_royal_coll_922125_313698_ORI_2.jpg
Carlton_House,_Throne_Room,_by_Charles_Wild,_1818_-_royal_coll_922178_257094_ORI_0_0
“Throne Room, Carlton House.” ca. 1818. Watercolour with touches of bodycolour and gum arabic over pencil with an engraved aquatint version published as plate 86 of W.H. Pyne’s 1819 work “The History of the Royal Residences.” Royal Collection Trust. In the public domain in the United States because the artist died over 70 years ago. via https://commons.wikimedia.org/wiki/File:Carlton_House,_Throne_Room,_by_Charles_Wild,_1818_-_royal_coll_922178_257094_ORI_0_0.jpg
Screenshot (107)
“The King’s Closet, Windsor Castle.” Aquatint engraving, taken from W.H. Pyne’s 1819 work “The History of the Royal Residences.” William James Bennett,, engraver, after Charles Wild. In the public domain due to age. via https://fineartamerica.com/featured/the-kings-closet-windsor-castle-charles-wild.html
"The Ante Chamber to the Throne Room, Carlton House." ca. 1816.
“The Ante Chamber to the Throne Room, Carlton House.” ca. 1816. Watercolour, bodycolour and gum arabic over etched lines. Royal Collection Trust. In the public domain in the United States because the artist died over 70 years ago. via https://www.rct.uk/collection/922179/the-ante-chamber-to-the-throne-room-carlton-house