In County Longford, tucked into a hollow on a northeast-facing slope, lies what appears to be a medieval moated site at Aghnagarron.

On a northwest-facing slope near Castlerea in County Longford stands a formidable tower house dating from the late 16th or early 17th century.

Just southwest of an unclassified castle in Tully, County Longford, lies the remnants of what appears to have been a defensive bawn; a fortified enclosure that would have protected livestock and provided an outer line of defence for the castle's inhabitants.

At Rathcline in County Longford stand the remains of what was once one of Ireland's most impressive manor houses.

On a gently sloping hillside in County Longford, facing southeast across open pasture, stands an impressive circular mound known locally as the Moat at Glen.

About 60 metres southwest of a castle lies what may be the remnants of a historic bawn, a fortified enclosure that once protected livestock and provided defence for early Irish settlements.

On a northeast facing slope in County Longford sits the remnants of a medieval castle with a particularly turbulent early history.

At the northwest end of Lanesborough town, where the River Shannon flows into the northeastern corner of Lough Ree, lies a site of considerable medieval importance.

Standing on a prominent hill surrounded by pasture in Tully, County Longford, this motte and bailey castle represents one of Ireland's medieval defensive structures.

In the early 1600s, a castle stood in what is now Mosstown demesne in County Longford, appearing on a 17th-century map of Moydow barony in the townland then known as 'Dowclone'.

On the summit of a motte and bailey in Moatfarrell, County Longford, lie the grass-covered remains of what may have been an O'Farrell castle dating from the 16th century.

This 17th-century fortified enclosure at Rosduff Castle in County Longford offers a glimpse into Ireland's turbulent plantation era.

On a gentle rise overlooking the floodplains of Lough Ree's northern shore, the ruins of Corrool Castle command sweeping views across the Longford landscape.

Perched on a prominent rise overlooking the rolling pastures of County Longford, the ruins of Ballinamore Castle tell a story of early 17th-century plantation Ireland.

The fortified bawn at Portanure Castle in County Longford offers a fascinating glimpse into the defensive architecture of late 16th or early 17th century Ireland.