The Pena Palace in Sintra, Portugal, is a premier landmark of 19th-century Romanticism, celebrated for its fantastical blend of Neo-Gothic, Neo-Manueline, and Islamic architectural styles. Its importance lies in its role as the former summer residence of the Portuguese royal family, commissioned by King Ferdinand II, the "Artist-King," who transformed a ruined 16th-century monastery into a high-value masterpiece. In 1995, it earned UNESCO World Heritage status, recognized for its cultural and aesthetic significance. The palace's vibrant colors and eccentric silhouette serve as a high-quality symbol of Portugal's national identity and artistic heritage. It is also a key example of a "designed landscape," as the surrounding park was carefully planted with exotic species to create a premier, immersive botanical environment that complements the palace’s dreamlike architecture.