Harran is known for its adobe beehive houses, which were occupied until the late 20th century and are now a heritage attraction. The population has moved into the modern town of Altınbaşak, some 50km south of Sanfiurla. These are the remains of an ancient city, dating from 3500 BC and a major commercial and religious centre, mentioned in the Bible. It was an important Assyrian city, and its walls and fortifications are still to be seen. A photograph in John Henry Haynes: A photographer and Archaeologist in the Ottoman Empire 1881–1900 shows Harran in 1884 when it was still a thriving community.