Árdscoil Éanna is a primary and secondary school on the Crumlin Road in Dublin, Ireland, called the 'hen-house' by generations of local children because of the bantam- and guinea-fowl that used to be kept there in the ruins of the building that once housed one of the world's largest linear particle accelerators. The present unkempt state of the premises may be best appreciated from the upper salon of any omnibus travelling from Tallaght to the city centre.