Muslims are called to prayer from the minaret. The minaret is a spire that is usually taller than the mosque itself and topped with either an onion dome or conical crown. Architectural styles vary by region and period.
Muslims are called to prayer five times per day: dawn, noon, mid-afternoon, sunset and night. Modern mosques generally broadcast the call to prayer via microphone within the mosque and broadcast from speakers inside the minaret. The word comes from the Arabic "manara," meaning "lighthouse." The tallest minaret in the world at 689 feet is part of the Hassan II Mosque in Casablanca, Morocco.