Portugal is home to numerous castles that reflect its rich history and architectural diversity. Many of these structures date back to the Middle Ages, showcasing styles from Romanesque to Gothic. Notable examples include the Castle of São Jorge in Lisbon and the Pena Palace in Sintra, both of which attract many visitors each year. These castles served various purposes, from military defense to royal residences. They often feature impressive walls, towers, and battlements, providing insight into Portugal's past. Today, many of these castles are preserved as historical sites, allowing tourists to explore and appreciate their cultural significance.