Al-Azhar Mosque, a historic and significant center of Islamic learning in Cairo, offers free entry, though donations are welcome. Visitors typically spend 1-2 hours exploring its vast courtyards and prayer halls. It is easily accessible for solo exploration, but a knowledgeable guide is highly recommended to fully appreciate its rich history and architectural details. While open year-round, it's advisable to avoid peak prayer times, especially Friday midday, and to plan visits during cooler morning or late afternoon hours in summer due to Cairo's intense heat; Ramadan may also see altered hours and increased crowds. Women are required to wear head coverings and modest attire, with shawls often available for loan. The mosque is generally accessible, though some older sections or very crowded times might pose minor challenges for those with mobility issues, and shoes must be removed before entering prayer areas.