This is the Grand Sultan Qaboos Mosque, one of the largest mosques in the world, located in Muscat, the capital of Oman. It is open to worshippers 24/7, but for regular visitors, it is only open for a few hours in the morning. In this mosque, female tourists are required to wear long clothing and a headscarf, and men are not allowed to enter wearing shorts. The mosque provides clothing to those who do not have these dress requirements.