1 (or Structure I) is a pyramid to the east of the site core. A number of stelae were erected at its base by Yuknoom Took' K'awiil in 731. Because it was built on a low hill, Structure 1 appears to be higher than Structure 2, although this is not the case.Structure 2 (or Structure II) is a massive north-facing pyramid temple, one of the largest in the Maya world. Its base measures square and it stands over high. In common with many temple pyramids in the Mesoamerican cultural region, the pyramid at Calakmul increased in size by building upon the pre-existing temple in order to increase its bulk. The core of the building (Structure 2A) is a triadic pyramid dating to the Late Preclassic period, with this ancient building still forming the highest point of the structure. In the Early Classic a massive extension was added to the front of the pyramid, covering an earlier stucco-covered building on the north side. Three new shrines were built upon this extension (Structures 2B, 2C and 2D), each of these shrines had its own access stairway. Structure 2B was the central shrine, 2C was to the east and 2D to the west. The facade possessed six large masks set between these stairways, three arranged vertically on each side of the central stairway. Structure 2 is similar in date, size and design to the El Tigre pyramid at El Mirador, and associated ceramics are also similar. At a later time buildings were erected along the base of the facade, each of these contained stelae. In the 8th century AD, Structure 2B was entombed under a large pyramid and a stepped facade covered the giant masks. Later another facade was built over this 8th century stepped frontage but it may never have been finished. In the Late Classic a nine-room palace was built on top of the pyramid, supporting a roof comb that had painted stucco bas-relief decoration. The rooms were arranged in three groups of three, each room positioned behind the next. The entire Late Classic palace measured . The front two rows of rooms (Rooms 1 through to 6) were used for food preparation, metates and hearths were found in each of them. Room 7, the southwest room, was a sweatbath.Structure 3 (or Structure III, also known as the Lundell Palace) is southeast of Structure 4, on the east side of the