A Maya pyramid at El Zotz, Guatemala, with images done in dramatic painted stucco and a royal tomb full of artifacts and human remains, may have linked the deceased lord to the eternal sun; technicians using ancient building techniques work to save crumbling walls at  “The Mithraeum of the Painted Walls” in Ostia Antica, the harbor of classical Rome; workers restore Paschoal Hall, the central structure of Kalaupapa on Molokai Island, Hawaii, where lepers have sought refuge and treatment since the 1860s.