Boasting a historic old town of Roman ruins, medieval churches, cosmopolitan cafes, and quality museums set on a small peninsula, Zadar is an intriguing city. Spend a day walking around Zadar's historic center. If there is a breeze, start at the sea organ, an art installation consisting of a series of pipes cut into the promenade. Soft, meditative chords become a slightly alarming cacophony of groans when the waves are choppy. The same artist also created the Monument to the Sun, a large disc of solar-powered cells that becomes a multicolored disco ball as the sun sets. More classical sights include the Roman forum, of which only a few columns and an altar remain. Stones from here were used to build the neighboring rotunda of 9th-century St Donat's Church and are clearly visible.