Snowdon is the highest mountain in Wales at 1,085 meters above sea level. It is located in Snowdonia National Park in Gwynedd and is a popular hiking destination. North Wales is known for its castles built during the 13th century by Welsh princes and English King Edward I, including Conwy Castle, Harlech Castle, and Caernarfon Castle. The annual Llangollen International Musical Eisteddfod is a major music festival held in July that features performers from around the world. Bangor University is located in the city of Bangor in Gwynedd County in North Wales.