Visiting the Hassan II Mosque was the absolute highlight of my time in Casablanca. From the moment I stepped onto the oceanfront esplanade, I was struck by its sheer scale—the intricate zellij tilework, carved cedar ceilings, and the towering 210-meter minaret are breathtaking in person. The guided tour was well-organized and gave fascinating insight into Moroccan craftsmanship and Islamic tradition, but the most unforgettable moment was standing in the glass-floored prayer hall, watching the Atlantic waves roll directly beneath my feet. Even if you're not religious, this is a masterpiece of art and engineering that deserves a spot on any traveler's itinerary. Just be sure to arrive early for the best light and fewer crowds—it's an experience that will stay with me forever.