The Monastery of Serra do Pilar, a UNESCO World Heritage Site since 1996, is a remarkable architectural feat with its circular church and cloister, unique in Portugal. This former monastery, now a symbol of Vila Nova de Gaia, offers breathtaking views of the Dom Luís I Bridge and the historic center of Porto. Its rich history includes a pivotal role during the Siege of Porto in 1832, and today, it continues to stand as a testament to the region's cultural and historical heritage.