Fajada Butte is home to the one of the most famous prehistoric astronomical observatories. Shadows from the sun and the moon are cast by three stone slabs onto a spiral petroglyph. The placement of these shadows mark out the solstices, equinoxes and both Lunar Standstills. The recording of significant cycles of both the sun and the moon with one device is unique in the ancient world. The Exploratorium has put together a clever flash demonstation of the patterns created by various astronomical events on their Fajada page.

Unfortunately visitors are no longer allowed to see the slabs since it's thought that too much foot traffic has caused their position to shift slightly. The shadows cast no longer fall in their original configuration.

Most photos of the canyon are taking in bright sunlight with blue skies. The snow created an interesting mood.