This tremendous Renaissance square is the main focal point of Úbeda's social life with cafés and curio shops around it. It was also designed to show off the 16th century Renaissance buildings of Andrés de Vandelvira (who designed the cathedrals and Baeza and Jaén). It compares well to the Plaza Mayor/Plaza de Leones in Baeza.
From the bus station in Úbeda follow the brown tourist signs to the 'Zona Monumental' and you'll eventually reach the square.
It is beautiful, a huge plaza surrounded by sandstone mansions and churches.