Use supersampling. Either at the driver level (works with nearly all 3D games - enable the feature there, then select a higher than native resolution in-game) or directly in games that come with the feature (usually a resolution scaling option that goes beyond 100 percent). It’s very heavy on your GPU depending on the title, but the resulting image quality of turning several rendered pixels into one is sublime. Thin objects like power lines, as well as transparent textures like foliage, hair and chain-link fences benefit the most from this.

Always keep the limits of your hardware in mind though. Running a game at 2.75 or even four times the native resolution will have a serious impact on performance, even with last-gen stuff.

Emulators often have this feature as well, by the way - and here, it tends to hardly matter, since emulation is usually more CPU-bound (except with very tricky to emulate systems). Render resolution and output resolution are often separate. I’ve played old console games at 5K resolution, for example. Even ancient titles look magnificent like that.

You’re looking for vector graphics. You could try Asteroids or Lunar Lander.

Aliasing is a byproduct of trying to draw a curved line across square pixels. It’s a deficiency of raster graphics, not the fault of the game.

While a costly option, once you reach a certain resolution and texture quality you’d likely be able to disable AA entirely.