Deep in the Guatemalan jungle, Tikal once held more than 12,000 buildings, making it the largest city the Maya ever built, and this film asks how a civilization without the wheel or metal tools raised pyramids like Temple IV to such scale. LiDAR surveys sweep the canopy to reveal causeways, reservoirs, and building footprints invisible from the ground, letting archaeologists map the city's water management system, a network of reservoirs and canals that kept a dense population alive through dry seasons. The film walks through the astronomical observatories the Maya aligned to track solstices and plan ceremonies, and examines the labor and logistics behind hauling limestone blocks without draft animals or wheeled carts. Researchers on site explain what the LiDAR data has changed about estimates of Tikal's population and reach, showing a city far larger and more interconnected than earlier ground surveys suggested. The result is a clear account of engineering solved through manpower, planning, and astronomy rather than the tools usually assumed necessary for cities this size.