The beating heart of Bosa is the Aragonese Tower, an imposing bastion that stands proudly defending the town, a silent witness to a thousand-year history. Impossible to resist the lure of Serravalle Castle, perched on the top of a hill: from up there, the breathtaking view of the town, the Temo River winding placidly toward the sea and the Mediterranean Sea fading into the horizon leaves you breathless.