There are slot canyons, and then there's Antelope Canyon on the Navajo Nation just outside of Page, Arizona. If you've seen a photo of a slot canyon, chances are, it's Antelope. Discovered in 1931 by a young girl herding sheep (as it seems are many amazing discoveries) it was largely ignored until the 1980's when it started to catch on with photographers who loved the beams of light that shine down at particular times during the day.