In the jungle south of the Grupo de las Cruces is the Southern Acropolis, where archaeologists have made some terrific finds in recent excavations. You may find part of the area roped off. The Acrópolis Sur appears to have been constructed as an extension of the Grupo de las Cruces, with both groups set around what was probably a single long open space.

Templo XVII, between the Cruces group and the Acrópolis Sur, contains a reproduction carved panel depicting Kan B’alam, standing with a spear, with a bound captive kneeling before him (the original is in the site museum).

In 1999, in Templo XIX, archaeologists made the most important Palenque find for decades: an 8th-century limestone platform with stunning carvings of seated figures and lengthy hieroglyphic texts that detail Palenque’s origins. A reproduction has been placed inside Templo XIX. The central figure on the long south side of the platform is the ruler Ahkal Mo’ Nahb’ III, who was responsible for several of the buildings of the Acrópolis Sur, just as the Grupo de las Cruces was created by Kan B’alam II. Also on view is a wonderful reproduction of a tall stucco relief of U Pakal, the son of Ahkal Mo’ Nahb'.

Also discovered in 1999, Templo XX contains a red-frescoed tomb built in 540 that is currently Palenque's most active dig. Archaeologists began restoration work inside the tomb in 2012, and now believe that it might be the final resting place of K'uk B’alam I, an ancestor of Pakal.

In 2002 archaeologists found in Templo XXI a throne with very fine carvings depicting Ahkal Mo’ Nahb', his ancestor the great Pakal, and his son U Pakal.