Skyline highlight is a term used to describe the most prominent features of a city skyline, such as spires and steeples. A SPIRE is a tall, slender tower that is usually part of a church or other religious building, while a STEEPLE is a tall tower with a pointed roof, often found on churches. Both spires and steeples are common features of city skylines, and they are often the most eye-catching elements of a skyline.