A silhouette falling towards a small island with a forest, mountain, and a number of buildings. The text reads: "MYST: The Surrealistic Adventure That Will Become Your World."
A large tree crading a sphere inside a canyon. The tree is dotted with lit windows, implying it's being used as a small settlement. The text reads "Riven: The Sequel to Myst."
A building perched on the shorn top of what looks like a giant tusk. The rocky structures surrounding it are filled with bridges and staircases. The text reads: "Myst III: EXILE."
A view from inside one of several buildings that may be greenhouses in a desert environment. The ghostly face of a young girl can be seen through one of the windows. The text reads: "MYST IV: Revelation."
You just played my obvious one, so...
I don't know if it counts as obscure or niche since it was the most popular PC game in the world before the Sims came along, but the Myst series is very good.
Five games in the main series, plus Uru.