"The building has a highly irregular plan, with stone foundations 3 or 4 feet thick," she said. "One wing of the building is about 60 feet long, flanking a space that has walls running at right angles. Some walls run on a diagonal to the grid, or are curved. There are paved areas alternating with beaten earth floors and what I believe to be a large courtyard in the middle. Some of the foundations are so heavy and thick that they could easily have supported multistoried elements. Within the building's courtyard, de Grummond said, is a freestanding sandstone platform that...