Photos credit: National Institute of Anthropology and History (INAH)
 Temple XX in the ancient Mayan city of Palenque. Under the temple is a 1,500-year-old burial chamber, unreachable except by micro-camera. |
 To get to the hidden tomb, researchers had to descend from the top of the temple. |
 A ladder leads into Temple XX, from which archaeologists threaded a video camera into the burial chamber. |
 A 6-inch (15 cm) by 6-inch hole leads to the unexplored burial chamber. |
 The first images of the inside of the 1,500-year-old burial chamber reveal red-and-black painted walls. |
 A mural decorating the walls of the 1,500-year-old burial chamber consists of nine characters outlined in black on red. |
 Murals on the tomb walls. |
 A stepped ceiling and the thick slab gateway of the burial chamber. |
 Pottery, jade and shell sit on the burial chamber floor. Archaeologists believe the burial chamber holds the fragmented bones of a ruler from around 431 to 550 AD. |