Guatemala. It's the most recent of the Tikal pyramids dated to around 869 AD. It's believed it may contain the tomb of Jasaw Chan Kʼawiil II, Tikal's last known ruler. It stands at 55m tall. The pyramid is mostly covered in and enclosed with vegetation so only the roof comb is visible from the ground and likewise from the tops of other nearby pyramids I climbed (more about that later)