Skyrim with 2-4k mods. Some seriously good modders out there with a taste for eye candy.
Metro Last Light, mostly for the overgrowth and light visuals/effects.
In recent years I'd say Star Citizen for graphical detail and geometry.
Step right up come on in, feel the buzz in your veins, I'm like an chemical electrical right into your brain and I'm the one who killed the Radio, soon you'll all see
So pay up motherfuckers you belong to "V"