Doe Castle, located in County Donegal, Ireland, is a historical stronghold with roots dating back to the early 15th century. Originally built by the Quinn family, it later came into the hands of the MacSweeney clan. The castle sits on a small peninsula surrounded by water and features a four-story tower-house. Over the years, it changed hands multiple times during the struggle for control between the English and Irish. Today, the castle is a national monument and offers guided tours during the summer months.