Kilmainham Gaol is one of the largest unoccupied jails in Europe.
No longer in use, it has been converted into a museum in memory of Ireland's quest for independence from Britain.
Many of the the leaders of the Irish rebellion in 1916 (the Easter Rising) were imprisoned and executed here by the British.
The jail was built in the 1780's and officially decommissioned in 1924.
During the 1800's, and especially during the years of the potato famine, the jail housed as many as 5,000 "criminals" in a facility built to house no more than 200. This included children as young as five years old, who were imprisoned for petty theft of food items such as bread.
It is considered to be the Irish Bastille.
