The Castle houses the magnificent State Apartments, the Chapel Royal, a 13th century Tower and some of its Medieval structures. Dublin Castle is the heart of historic Dublin. It is one of the most important buildings in Irish history.
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It's completely free to wander the grounds of Dublin Castle (pictured), although you can expect to pay a nominal fee to join a guided tour inside (around 5 Euros). While you're there, be sure to pay a visit to the free onsight museums and library.
Dublin Castle is the historical heart of the city. Built in the 13th century by King John of England. It served as a military fortress, a prison, treasury, court of law, and the seat of English Administration in Ireland for 700 years. Today it's used for important State events and Presidential Inaugurations.
The castles are watch towers outside the city walls. The castle is Dublin Castle and is repeated three times because of the mystical significance of the number three. The castles are not castles but represent three gates into the ancient Viking city.
From 1204 until 1922 it was the seat of English, and later British rule in Ireland. During that time, it served principally as a residence for the British monarch's Irish representative, the Viceroy of Ireland, and as a ceremonial and administrative centre.