Man-made underground passage in Ardborra

Situated in pasture. Not depicted on the 1837 OS 6-inch map or the revised 1913 ed. OS 25-inch map. Monument described in 1977 as a possible Man-made underground passage marked with an ‘X’ on the OS working map and not previously recorded (SMR file). The entrance is now partially blocked and it is largely inaccessible. No surface remains visible today on Digital Globe aerial photographs. Compiled by Alison McQueen, Vera Rahilly and Caimin O’Brien. Date of upload: 29 July 2019