Walaqad kaththaba as-habu alhijri almursaleen (surah Hijr: 80)

Tafseer Tafheem-ul-Quran by Syed Abu-al-A'la Maududi

(15:80) The people of Al Hijr *45 also treated the Messengers as impostors

Wa laqad kazzaba ashaabul Hijril mursaleen

*45) AI-Hijr was the capital city of the people of Thamud, and its ruins are found near the modern city of Al-'Ula' which is to the north west of Al-Madinah, and lies on the route from AI-Madinah to Tabuk. Though the caravans had to pass through the valley of Al-Hijr, the Holy Prophet had forbidden the Muslims to stay in the valley on their journey.
When Ibn Batutah reached there in the eighth century of Hijrah on his way to Makkah, he wrote: "I have seen the buildings of Thamud hewed into red mountains; the paintings look so bright as if they have been put on only recently....and rotten bones of human beings are found in them even today." (See E.N. 57 of VII.)