Final answer:
The mihrab is a significant feature of a mosque; it is a niche indicating the direction of Mecca that Muslims face during prayer, often decorated elaborately to highlight its importance.
Step-by-step explanation:
One significant feature of a mosque is the mihrab, a niche in the qibla wall that indicates the direction of Mecca, which Muslims face during prayer. The mihrab is not only a practical feature but also often intricately decorated, symbolizing its importance as the focal point in the prayer hall. The qibla wall where the mihrab is located is usually the most ornate part of the mosque, due to its significance in the Islamic faith as the wall facing Mecca, the birthplace of Islam. The decoration of the mihrab, often with calligraphy and geometric patterns, emphasizes the sacred and directionally significant nature of this architectural element.