Megastructures, an article in Strange Horizons, is all about fantastically large objects in science fiction — “any single artifact that challenges human preconceptions of size,” from Dyson spheres to space elevators and Halo’s ring.

The best of these are awe-inpsiring — excellent fuel for worldbuilding and campaign design, as well as being just plain cool. (I freely admit to being biased: I’m a huge sci-fi buff.)

This article offers a good overview of around a dozen of the best-known sci-fi megastructures, suitable for use as locations for set-piece encounters or backdrops for entire campaigns. (Via Metafilter.)