What is that big black box from mecca?

The big black box from Mecca is the Kaaba, a sacred structure located in the center of the Masjid al-Haram mosque in Mecca, Saudi Arabia. It is the most important site in Islam, and Muslims around the world face towards it during prayers. The Kaaba is a cuboid building covered in a black silk cloth, known as the Kiswah, and is the focal point of the Hajj pilgrimage, which every Muslim is required to undertake at least once in their lifetime if they are able.