Set atop a pine-covered hill, Bellver Castle offers some of the most breathtaking panoramic views of Palma and its bay. What makes this 14th-century fortress truly special is its rare circular design, the only one of its kind in Spain. After a pleasant, though uphill, walk of about 15-20 minutes from the nearest bus stop through the woods, you'll be rewarded with a fascinating journey through the city's history inside the museum and the chance to explore the castle's unique architecture. The general admission is 4€, but it's free on Sundays, making it a perfect and affordable outing.