Majlis al Jinn is the second largest known cave chamber in the world, as measured by the surface area of the floor (it ranks lower when measured by volume). The cave is located in a remote area of the Selma Plateau at 1,380 metres above sea level in the Sultanate of Oman. It’s name means the meeting place of the jinns, jinns being the supernatural creatures in Islamic and Arabic folklore.
Access to the cavern is only through a free descent of one of three vertical entrances in the ceiling. Cavers entering Majlis al Jinn require about 200m of specialized rope and equipment to descend and ascend safely. For several years tourism companies had been providing caving trips into Majlis al Jinn, providing equipment and training.
It might take up some time to prepare for it, but it’s definitely worth it.
Here are some photos to prove it.