Other explorers have since visited Palenque, and reported on the ruins by pen and pencil; but it is not certain that all the ruined edifices belonging to them have been seen, nor that the explorations have made it possible to determine the ancient extent of the city with any approach to accuracy. The very great difficulties which obstruct all attempts at complete exploration have not allowed any explorer to say he has examined or discovered all the mouldering monuments hidden in the dense and tangled forest, even within the space allowed by Del Rio’s “half league” from the river, not to speak of what may lie buried and unknown in the dense mass of trees and undergrowth beyond this limit. The largest known building at Palenque is called the “Palace.” It stands near the river, on a terraced pyramidal foundation 40 feet high and 310 feet long, by 260 broad at the base. The edifice itself is 228 feet long, 180 wide, and 25 feet high. It faces the east, and has 14 doorways on each side, with 11 at the ends. It was built entirely of hewn stone, laid with admirable precision in mortar which seems to have been of the best quality. A corridor 9 feet wide, and roofed by a pointed arch, went round the building on the outside; and this was separated from another within of equal width. The “Palace” has four interior courts, the largest being 70 by 80 feet in extent. These are surrounded by corridors, and the architectural work facing them is richly decorated. Within the building were many rooms. From the north side of one of the smaller courts rises a high tower, or pagoda-like structure, thirty feet square at the base, which goes up far above the highest elevation of the building, and seems to have been still higher when the whole structure was in perfect condition. The great rectangular mound used for the foundation was cased with hewn stone, the workmanship here, and every where else throughout the structure, being very superior. The piers around the courts are “covered with figures in stucco, or plaster, which, where broken, reveals six or more coats or layers, each revealing traces of painting.” This indicates that the building had been used so long before it was deserted that the plastering needed to be many times renewed. There is some evidence that painting was used as a means of decoration; but that which most engages attention is the artistic management of the stone-work, and, above all, the beautifully executed sculptures for ornamentation.