The term 'Cathedral Topper' refers to two architectural features that are often found on the tops of cathedrals. The first is a SPIRE, which is a tall, slender tower that rises from the roof of a building. It is usually made of stone or metal and is often decorated with carvings or sculptures. The second is a CUPOLA, which is a dome-shaped structure that sits atop a building. It is usually made of brick or stone and is often decorated with stained glass windows. Both the SPIRE and the CUPOLA are iconic features of many cathedrals and other religious buildings.