A mission to discover and re-create unexcavated worlds still hidden beneath the earth.　　Episodes include…　　S1E1 Fortress of the Knights Templar　　S1E2 Ghost City of the Pacific　　S1E3 El Dorado City of Gold　　S1E4 Stonehenge　　S1E5 Petra's Hidden Origins　　S1E6 Inca Island in the Sky

　　National Geographic Explorer Albert Lin ventures into the Guatemalan jungle to explore how a new high-tech treasure map is revealing tens of thousands of ancient ruins. Now, dozens of archaeologists are heading on a voyage of discovery, exploring lost ruins for the first time in 1500 years. And what they're finding is rewriting the history of one of the world's most mysterious ancient civilisations - the Maya.　　Episodes include…　　1 Secrets of the Snake Altar　　2 Secrets of the Underworld　　3 Secrets of the Sun God　　4 Secrets of the Lost City