Mushroom forest Ancient Cappadocia King's Garden. The forest is composed of volcanic magma, and the black part of the forest is composed of volcanic ash. The volcanic rock surface is hard, the interior is looser than loess, the soil on the rock wall falls gently, and the overall structure is very strong. Suitable for people to open caves, similar to Yan'an caves, warm winter and cool summer, but not humid, but also earthquake resistant and durable.