Open to visitorsa Cadw site, free to enter — check opening times before you go
Earthworks onlybanks, ditches and platforms — read the ground, not walls
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Twthill (Further and Additional Areas) preserves the earthworks of a former medieval motte-and-bailey castle in Denbighshire. It is the only motte-and-bailey castle the Albion Guide charts in the county. It is looked after by Cadw.
The nearest railway station is Rhyl, 3.9 km to the north-west. Nearby castles include Castell Rhuddlan and Dyserth Castle.