Sweathouse at Annacarney in county Wicklow...

...photographed by ex-megalithomaniac Ian Thompson (here seen with Rover) in 2002.

 

compare with the sweathouse at Legeelan, county Cavan

 

The ceiling.

Glenasheevar, Fermanagh : ceiling.

Port, Cavan : ceiling closed by large slab.

Corratober Lower, Cavan : the doorway from inside.