Definition
A Martello tower is a small defensive fort, built primarily during the 19th century. They were designed to withstand cannon fire and protect coastlines. Think of them as the medieval castle's tougher, smaller cousins. They are characterized by their round shape, thick walls, and a single, centrally mounted gun. Martello towers were often built in strategic locations to guard against invasion, particularly during the Napoleonic Wars. They are a testament to military engineering of the era.