The name Verne Club, gave me a hint and so I started digging. The illustration your link goes to closely resembles illustrations for Around The World in 80 Days and Journey to The Center of the Earth.

Though, the image here isn't from either book.

I am unfamiliar with Verne's books so I am unsure if I can assist you further.

I also found this thread from 17 days ago, not sure if it will help. But its talking about The Verne Club as well.

Hope it helps.

https://www.reddit.com/r/ARG/comments/ouak4b/arg_points_to_lovecrafts_grave_help_needed/?utm_medium=android_app&utm_source=share