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Photo: Cianwal, CC BY-SA 4.0 via Wikimedia Commons
The prominent hillock just south of the river is artificial: it was probably built over a Neolithic passage tomb, but has never been excavated. It became fortified with a motte-and-bailey in Norman times then by a stone castle. Here in 1649 the defenders of the town made their last stand before surrendering to Cromwell, but an earlier demand for surrender had been spurned, so Cromwell reckoned he was within his rights to slaughter them. In the 18th century a barracks was built around the hillock, and in 1808 it was capped by a Martello Tower. The last military action came in the Civil War of 1922: the fort was occupied by forces resisting the Anglo-Irish Treaty, so they were shelled and dislodged by Irish government troops. The museum displays the town's turbulent history, and admission includes the Martello Tower, with great views (and artillery positions) on its terrace. There's a cafe in the barracks yard.
Millmount is a large fortified complex situated on a great mound on the South bank of the River Boyne located in Drogheda, County Louth, Ireland. The fort has played a crucial part in Drogheda's history and has been a dominant feature from Norman settlement, to Cromwell's invasion to the more recent Civil War in 1922, in which the famous Martello tower was shelled and all but destroyed. Today the complex houses the Millmount Museum which houses a wide variety of artifacts of local and national importance. The complex is Drogheda's most dominant feature, clearly visible from all parts of the town. The Martello tower is affectionately known as "The Cup and Saucer" by locals. The whole fort is a national monument and has been designated as Drogheda's Cultural Quarter.
Stately mansion built around 1715 with a terraced walled garden. There's also a museum of vintage racing cars, collected by Gabriel de Freitas, a notable female racing driver of the 1960s and 1970s. The estate is used as an event space and isn't open to individual visits. There are occasional open days and guided tours in summer, see website.
Cistercian Abbey founded in 1142 by St Malachy to reform the lay-about standards of Irish monks. In 1152 it hosted the synod of Kells-Mellifont, and it was the leading abbey in Ireland until the Dissolution in 1539. Much of its masonry was then re-used to make a Tudor fortified house, where the 1603 Treaty of Mellifont ended the Nine Years War, and where William of Orange was based before the Battle of the Boyne. Little remains of the medieval buildings: the main standing ruin is the 13th-century lavabo, where the monks performed their ablutions, so you come all this way to admire a Gents.
Modern military exhibits, basically a personal collection that got out of hand. Interactive and family-oriented and you can even book to drive a tank.
Theme park with water slides, zipline, climbing wall, bowling alley and so on. You pay for individual activities, there isn't a day-pass.
This is one of the oldest courses in Ireland, a sharp left-hand oval of 9 furlongs. It has both Flat and National Hunt (jumps) races. On race days a free shuttle bus meets the trains at Drogheda.