The easy access to the summit provided by the Mount Evans Highway has made it a popular location for scientific research. Arthur H. Compton conducted pioneering research on cosmic rays on the mountain in 1931, shortly after the road to the summit was completed. The University of Denver built a pair of A-frame buildings on the summit to house cosmic-ray researchers. By the 1950s, Mount Evans, the Aiguille du Midi, the Pic du Midi and the Jungfrau were considered the premier locations for high-altitude physics experiments.