Sons of Saturn seems like a pretty unique point and click adventure, with the developers using filtered photographs they took of various abandoned real-world locations for their setting.
The developers mentioned they spent several years "photographing abandoned asylums and industrial sites all over the world for use in Sons of Saturn". More about it: "You've returned to the collapsing underground city of Minerva to find out what happened to your mom, who you abandoned while fleeing the city. If you want to find the answers you're looking for, you'll have to navigate a labyrinth of sewers and rooftops, piece together your history from whatever clues you can scrap together, and contend with the lingering spirits of those who weren't lucky enough to die during the city's collapse"
You can follow it on Steam. It will have Native Linux support at release.