Historic buildings and monuments in Co. Offaly
County Offaly has 4,879 recorded archaeological monuments in the national Sites and Monuments Record; the 22 buildings below are the county's entries in the National Inventory of Architectural Heritage (NIAH) rated International or National, out of 1,196 recorded post-1700 structures county-wide.
Monuments to visit
Please note that many of these monuments may be on private land and may not be publicly accessible. When setting out to visit monuments please ensure that you wear appropriate footwear and clothing. Access to monuments without Visitor Services may be across uneven ground which may not be suitable for everyone and, in particular, wheelchair users.
- An Early Christian site founded by St. Ciarán in the mid-6th century on the eastern bank of the River Shannon.
- The name Seir Kieran derives from Saighir Chiaráin, meaning ‘the fountain of Ciarán’.
NIAH buildings rated International or National
National Inventory of Architectural Heritage entries for Co. Offaly, curated to buildings rated International or National.
| Name | Type | Period | Rating |
|---|---|---|---|
| Banagher Bridge | bridge | 1840–1850 | National |
| Bellair House | country house | 1805–1810 | National |
| Birr Castle | country house | 1835–1845 | National |
| Birr Castle | foot bridge | 1820–1830 | National |
| Birr Castle | building misc | 1840–1850 | National |
| Cangort Park | country house | 1805–1810 | National |
| Charleville Castle | country house | 1800–1815 | National |
| Cloghan Castle | country house | 1650–1850 | National |
| Clonyhurk Church | church/chapel | 1800–1840 | National |
| Durrow Abbey | country house | 1835–1845 | National |
| Gloster House | country house | 1710–1750 | National |
| Keeloge Battery | battery | 1810–1820 | National |
| Kinnitty Castle | hotel | 1820–1840 | National |
| Leap Castle | house | 1550–1750 | National |
| Meelick Martello Tower | martello tower | 1810–1815 | National |
| Saint Carthach's Church (Rahan) | church/chapel | 1150–1200 | National |
| Saint Columba's Catholic Church | church/chapel | 1825–1835 | National |
| Shannon Bridge | bridge | 1755–1760 | National |
| The Abbey | house | 1780–1820 | National |
| Tullamore Courthouse | court house | 1830–1840 | National |
| Tullamore General Hospital | hospital/infirmary | 1920–1940 | National |
| Tullynisk House | country house | 1790–1820 | National |
Plan a visit around Co. Offaly
NIAH Buildings Open Data, captured June 2026; NMS Monuments to Visit, captured June 2026. Both data.gov.ie, CC-BY 4.0 (Dept of Housing, Local Government and Heritage). See methodology for the curation rule.