The ancient Mayan’s were a highly sophisticated people from what is now Guatemala. The Mayans were highly skilled in agriculture, architecture, and astronomy. Though many of the books written by the Mayans were burned by Christian monks in the 1500’s, a few survived, including one known as the Dresden Codex. The Dresden Codex is a Mayan book made from tree bark, detailing astronomical phenomena in their days. The codex is 11.5 feet in length, made up into 39 sheets. One of the biggest problems in modern times with the Dresden codex, is that many scholars have tried to place specific dates in correlation with dates on the Christian calendar. Today, the Dresden codex is housed in a state library in Dresden, Germany. An exact replica is housed in the National Archaeological Museum in Guatemala City.