Loughcrew is a two-for-one deal—beautiful 19th-century pleasure gardens dotted with lakes, perfect for picnicking, and also, a short distance away, one of the biggest megalithic burial grounds in Ireland. The 30 passage tombs of Loughcrew are known locally as Slieve na Calliaghe, which translates as “The Hill of the Witch.” It certainly is an eerie sight, three hills topped like crowns with symmetrical tombs—you can see them from miles away. The site is aligned with both the equinox and the pagan day of Samhain (Halloween), so that twice a year the dawn sun lights a heavily carved stone within one cairn. Crowds gather each year to see the phenomenon. Access to the cairns is free, but you need to pick up the key from the Loughcrew Coffee Shop, which is the wooden chalet-like building near the garden gatehouse. In summer it’s open daily from 11am to 5pm, in winter 10am to 4pm on weekdays, 11am to 4pm on weekends.