Topic: Underground Halls

The rock-cut ruins at Atlit, Israel, show extreme erosion on hard bedrock, suggesting they are significantly older than the well-preserved polygonal megaliths of Peru. Similar structures exist at Sierra de San Cristóbal in Spain, featuring massive walls and vast underground assembly halls that are currently closed to the public. These sites feature deep shafts and modern walls that block access to the most significant portions of the underground complexes.