Castle Saunderson stands as a fascinating architectural puzzle in County Cavan, its current form bearing little resemblance to the original fortification that once occupied this site.

In the early 17th century, during the Ulster Plantation, Sir Richard and George Grimes received a substantial grant of land in County Cavan; two portions of 1000 acres each that would become the estate of Corrasmongan.

In the rolling countryside of County Cavan lies the site of what was once a substantial fortified enclosure at Cordoagh.

In the townland of Drumcarn, County Cavan, the remnants of a castle tell a story that spans centuries of Irish history.

In the parish of Kilmore in County Cavan, the site of Lismore Castle tells a story of vanished grandeur through historical maps rather than physical remains.

On an oval earthen mound in Dungummin Upper, County Cavan, stands a curious monument that has puzzled historians for decades.

In the townland of Ballymagauran, County Cavan, the weathered limestone walls of a late medieval tower house stand as a testament to Ireland's turbulent past.

In the townland of Dundavan, County Cavan, lies what archaeologists believe to be the site of a 16th-century O'Reilly castle.

High on a drumlin hill in Castlerahan, County Cavan, the remains of a medieval ringwork castle offer a glimpse into Ireland's turbulent past.

In the village of Ballyconnell, County Cavan, the local Church of Ireland chapel sits atop a curious mound that has puzzled historians for decades.

In the countryside of Moynehall, County Cavan, a single weathered stone marks what was once a fortified plantation house from Ireland's turbulent 17th century.

At Ashgrove in County Cavan stands an 18th-century house that conceals a much older secret beneath its Georgian facade.

In the townland of Swellan Lower, County Cavan, a medieval fortification rises subtly from the surrounding landscape, its earthen banks and defensive ditch still clearly visible after centuries of weathering.

In the countryside of County Cavan, the site of Moynehall Bawn offers a tantalising glimpse into Ireland's plantation history, though little remains visible today.

Ballaghanea Island sits in the waters of Lough Ramor, accessible from the mainland by a shallow ford when water levels permit.