Greatest Natural Wonder

Places the planet made without any assistance. No buildings, no monuments, no human intervention — just geology, weather, and an enormous amount of time.

The entries operate at wildly different scales, and that is a large part of why comparing them is hard. The Grand Canyon is a mile deep and exposes something close to two billion years of rock, which is roughly half the age of the Earth. The northern lights are a magnetic field doing something visible. The Amazon is not a view at all but a system, and photographs of it consistently fail because there is no vantage point from which it looks like what it actually is. Salar de Uyuni is flat enough that satellites are calibrated against it.

The bracket runs to thirty-two wonders, and every image comes from Wikimedia Commons under a free licence. That constraint shapes the field slightly — a few famous places are represented by an amateur photograph rather than the postcard version.

The pictures are doing more work in this bracket than voters usually notice, and it is worth being a little suspicious of them. Several of these places are far more impressive to stand in than to look at, and one or two are the reverse.