2. Visit Beaumaris Castle
Located in a town of the same name, the Beaumaris Castle is a convenient day trip from Llanfair PG. Construction of the magnificent and well-preserved castle began in 1295, and it played an important role in the English Civil War of the 17th century. The castle presents a perfect exemple of concentric design, and although it was never completely finished, visitors can see the moated walls and gatehouses while exploring the extensive network of passageways.