Dolbadarn Castle stands above Llyn Padarn in Llanberis, Snowdonia, Wales. The castle was built by Llywelyn ap Iorwerth in the 13th Century and is 40 feet tall and 40 feet in diameter, and guarded by walls 8 feet thick.

Dolbadarn Castle stands above Llyn Padarn in Llanberis, Snowdonia, Wales. 

The castle was built by Llywelyn ap Iorwerth in the 13th Century and is 40 feet tall and 40 feet in diameter, and guarded by walls 8 feet thick.