Cosmic radiation was discovered in 1912, but its origins are not yet fully explicated. I will report on recent measurements by the Milagro collaboration of two component of this cosmic radiation: photons with 1 TeV (or more) energy, and the much more copious charged particles of similar energies. Since photons travel in straight lines from their source, one can do astronomy with these rare photons, to learn about the sources of such radiation. I will also discuss a follow-up project, HAWC (High Altitude Water Cherenkov) presently under construction in Mexico.