Dolbadarn Castle, built by Welsh prince Llywelyn the Great in the early 13th century, stands at the base of the Llanberis Pass in northern Wales. This fortification was not only a military stronghold but also a symbol of Llywelyn's power and authority. The castle features a large stone keep, considered one of the finest examples of a Welsh round tower. After being taken by Edward I in 1284, Dolbadarn Castle fell into ruin but became a popular subject for painters in the 18th and 19th centuries. Today, it is owned by Cadw and managed as a tourist attraction, showcasing its historical significance as a Grade I listed building.