El Castillo de Vilassar de Dalt is a medieval fortress dating to the 10th century, situated in Vilassar de Dalt near Barcelona with panoramic views to the Mediterranean Sea. The castle features distinctive architecture with four towers crowned with battlements flanking a central circular tower, complemented by Gothic windows and a rounded portal of large voussoirs. Originally documented from the X century, this architectural ensemble retains its medieval character and now serves as an event venue for weddings, banquets, and celebrations while maintaining its historical significance in Catalonian heritage.