The Odd One Out on the Spanish Coast: Torre del Puerco, a Square Sentry in a

Torre del Puerco, more commonly known as Torre Cabeza del Puerco, is an unusual square construction. Nestled in Chiclana de la Frontera, Spain, it's a solitary square watchtower, distinct from its round counterparts. Initially, it served a similar purpose, acting as a military observatory in the 16th century. Fast forward a few centuries to the 19th, and this peculiar structure found a new role, becoming a vantage point for tuna vessels. Here's the twist - it's still standing tall, boasting a better view of the sea than its round companions.

Sources: Wikipedia, OpenStreetMap, Wikidata, Wikimedia Commons