Messenger of Allah ﷺ used to enter Mecca from the high Thaniya and used to leave Mecca from the low Thaniya. (Using translation from Bukhārī 1575)
أَنَّ النَّبِيَّ ﷺ كَانَ يَدْخُلُ مَكَّةَ مِنَ الثَّنِيَّةِ الْعُلْيَا وَيَخْرُجُ مِنَ الثَّنِيَّةِ السُّفْلَى