Humans have been using a lava tube known as Umm Jirsan in Saudi Arabia for thousands of years. This unique underground shelter provided protection from the harsh desert environment and had a natural ventilation system. Archaeologists believe that the site was likely used for religious rituals and as a temporary dwelling for travelers. Today, Umm Jirsan serves as a reminder of human adaptability and innovation in utilizing natural resources for survival.
Source: gizmodo.com
