Castle Birr, County Offaly. This area has been the site of a castle since 1170, however, the addition of the Leviathan of Parsonstown in 1845 is what makes this site a must visit for science lovers.
Kinnitty Castle, County Offaly. This castle has been a home, a training college, burnt down by the IRA, but since 1994 has been a hotel.
Malahide Caste, County Dublin. The oldest parts of this castle date back to the 12th century. It was home to the Talbot family for 791 years, however now it is a spot for tourists.
Ferns Castle, County Wexford. Only half of this massive castle remains from the original castle from the 13th Century.
Glenveagh Castle, County Donegal. Glenveagh was once a vacation spot for celebrities like Marilyn Monroe, Clark Gable, Charlie Chaplin and Greta Garbo. Today it is a breathtaking national park.
Unlike modern homes, castle still retain most of their charm when in disrepair. Albeit not a true castle, but the Watch Tower Ruins at Slieve League in Bunglass still are a sight to be held.
Bunratty Castle, County Clare. The castle was built in 1425 by the MacNamara clan and today is a massive open air museum that is a wildly popular tourist attraction.
King John's Castle, County Limerick. This castle dates back to 1210 and sits next to the River Shannon. In 1900 the remains of a viking settlement were found on the site. Today it is an interactive museum.
Castle Kilcoe, County Cork. Built around 1450 by Dermod MacCarthy and then renovated and restored in the late 1990's by actor Jeremy Irons to become his family home.
Blarney Castle, County Cork. Arguably the most well known castle in Ireland. It is here where tourists can kiss the 'Blarney Stone' which will grant them the 'gift of gab'.
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