Bakkah

Indeed, the first house of worship established for humanity was in Bakkah, a blessed place and a guidance for all people.

3:96Lo! the first Sanctuary appointed for mankind was that at Becca, a blessed place, a guidance to the peoples;

In it are clear signs, including the station of Abraham. Whoever enters it is safe. Pilgrimage to the House is a duty upon those who can afford the journey. But whoever refuses, Allah is beyond need of all creation.

3:97Wherein are plain memorials (of Allah's guidance); the place where Abraham stood up to pray; and whosoever entereth it is safe. And pilgrimage to the House is a duty unto Allah for mankind, for him who can find a way thither. As for him who disbelieveth, (let him know that) lo! Allah is Independent of (all) creatures.