Polonnaruwa was the second capital of ancient Sri Lanka, boasting remarkably preserved ruins and monumental engineering feats like the Parakrama Samudra. A UNESCO World Heritage site, it is famous for its grand palaces, intricately carved temples like the Vatadage, and the majestic Gal Vihara rock statues. This historic city offers a deep dive into the island's medieval golden age, making it a captivating stop for cultural travelers.