Brownshill Dolmen (Dolmain Chnoc an Bhrúnaigh) is a very large megalithic portal tomb situated 3 km east of Carlow. Its capstone weighs an estimated 150 tons, and is reputed to be the heaviest in Europe. Known as the Kernanstown Cromlech, sometimes spelled as Browneshill Dolmen, it is sited on the former estate house of the Browne family from which it takes its name. The tomb was built between 4000 and 3000 BC.
One very unmistakable monument dating back to pre-historical times is the great Brownshill Dolmen the east of Carlow town.
Brownshill Dolmen has a granite capstone weighing over 100 tonnes, making it the largest of its kind in Europe. The massive capstone rests on two portal stones which flank a door stone and slopes downwards to the west where it rests on a low boulder.