Muslims are people who believe in Islam. They have a special place they value a lot called the Kaaba in Mecca. It's like their center. Muslims pray five times a day facing the Kaaba, and they also go on a special journey called the hajj to visit it at least once in their lives.

The Kaaba is in a big mosque in Mecca. It's like a big rectangular block in the middle of a big yard. It's called the Kaaba because it looks like a cube. The Kaaba is covered with a black cloth, so people can't see it. On one corner of the Kaaba, there is a special black stone. When people visit, they go around the Kaaba, kiss the black stone, and pray to their God, Allah.

Long ago, before Islam, there were many statues in the Kaaba. But then a man named Muhammad, who started the religion of Islam, came to Mecca and destroyed all the statues. He wanted the Kaaba to be a special place for only Allah, the God of Islam. Muslims don't worship the Kaaba or the black stone. They just think it's a very important and holy place.