Rathfalla or (Rath Bhaile - rath of the town) is described as a ring-fort in The Archaeological Inventory of County Tipperary. Vol. 1 - North Tipperary'.
I recently visited it as part of research for an article I was writing and discovered that rather than an external ditch which is the norm for ring-forts in Ireland it actually has an internal ditch which is more indicative of ceremonial use or a henge.
The diameter of the monument is 90m and the entrance is in the south-west.
Visited yesterday on the first properly warm day of the year. In a really lovely part of Derbyshire, but not easy to get to and rather lonely, this poor stone is almost entirely covered with dried mud/muck (although who knows when the field was last muck-spread as the grass was pretty long). It was a shame as I couldn't see the crinoids in it (-I love crinoids - if I was going to erect a standing stone, I'd use one full of fossils too! - ), apart from a little tiny one in the top.
Also Bradbourne church is worth visiting too - Saxon cross-shaft and Norman carvings round the door.