Rhosesmor is a small village near Mold, Flintshire. Its facilities include a post office, a church, a public house, a park, a primary school and a village hall. The village lies near the parishes of Halkyn and Rhes-Y-Cae. The hamlet of Wern-Y-Gaer is encompassed by the boundaries of the village.
The Post Office/Shop are open 'community hours' i.e. 08: 30 - 12: 30 Monday to Friday. The one remaining public house, the Red Lion, was re-opened in June 2006 having closed on New Years Day 2005. The Red Lion has once again become an important part of village life.
The new parish of Caerfallwch (the old name for the village) was created on 23 October 1876, from part of the township of Caerfallwch, which until that time had been in the parish of Northop.
The "London Gazette" of the 27th October 1876 defined the boundaries of the new parish:
"All that part of the parish of Northop in the county of Flint and in the diocese of Saint Asaph which is comprised within and is co-extensive with the limits of that portion of the township of Caerfallwch wherein the present incumbent of the said parish of Northop now possesses the exclusive cure of souls, or in other words, which consists of that portion of the said township of Caerfallwch which is not included within the limits of the consolidated chapelry of Saint John, Rhydymwyn, in the county and diocese aforesaid."
The village has a lead mining history and several of the buildings, particularly in the Wern-Y-Gaer area of the modern village are more than three hundred years old. The Celtic hill fort of Moel-Y-Gaer is above the village, which dates back to pre-Roman times.
There are extensive natural and man-made tunnels, caves and caverns under the village. This is because it has been a mining centre from pre-Roman times, as well as having an interesting subterranean structure. These features are documented in various books by Cris Ebbs and have been explored by the Grosvenor Caving Club. There is an underground lake under Rhosesmor, which is believed to be the largest in Europe. The Milwr Tunnel passes nearby.