Tatler source: "This includes machinery that causes a tree to rise from a trapdoor and three sets – a simple interior, a forest and a temple of Minerva – the latter being the oldest intact decor in the world, dating back to 1754 – ‘our own Mona Lisa,’ said Masson."

OP article: "What is it? The Temple of Minerva theater set (c.1754) from Marie-Antoinette’s private theater."

OP caption on picture of theater: "Temple of Minerva theater (c. 1754)"

This [0] is the Mona Lisa of Hacker News. (Most favorited post circa 2020, though now that would likely be something else.)

[0] https://jgthms.com/web-design-in-4-minutes/