Plaza Vieja, located in Old Havana, Cuba, is a historic square with a rich past dating back to the 16th century. Originally known as Plaza Nueva, it was a bustling market square and witnessed various events like executions, bullfights, and fiestas. Today, Plaza Vieja is a vibrant hub surrounded by colonial buildings and is a popular spot for locals and tourists to explore and soak up the lively atmosphere of Old Havana.