1. Ben Youssef Madrasa is an ancient Islamic educational institution in Marrakech, Morocco that dates back to the 14th century. It was named after the Marinid sultan Ali ibn Yusuf who had it built. The madrasa features intricate Moorish architecture and stunning decoration in its courtyards, halls, and prayer rooms. Visitors can marvel at the calligraphy, zellige tilework, carved cedar wood, and plasterwork that adorn the walls, ceilings, and columns. The madrasa also has a peaceful rooftop terrace that offers views of the surrounding medina and mosques.

2. The working hours of Ben Youssef Madrasa are from 9 AM to 6 PM every day except for Fridays, when it is closed for prayer. The phone number of the madrasa is +212 5243-91671.

3. The entrance fee for Ben Youssef Madrasa is 40 Moroccan dirhams (around $4.5) per person. Visitors can buy tickets at the entrance or online. The madrasa is located in the heart of the medina, near the Marrakech Museum, and can be reached on foot or by taxi.