2 Best Sights in North County Dublin, Dublin

The Howth Castle Gardens, next door to the Transport Museum and accessible from the Deer Park Hotel, were laid out in the early 18th century. The many rare varieties in the fine rhododendron garden are in full flower April through June; there are also high beech hedges. The rambling castle, built in 1654 and considerably altered in the following centuries, is not open to the public, but you can access the ruins of a tall, square, 16th-century castle and a Neolithic dolmen.

The National Botanic Gardens, on the northeastern flank of Glasnevin Cemetery and the south bank of the Tolka River, date from 1795 and have more than 20,000 varieties of plants, a rose garden, and a vegetable garden. The main attraction is the beautifully restored Curvilinear Range—400-foot-long greenhouses designed and built by a Dublin ironmaster, Richard Turner, between 1843 and 1869. The Great Palm House, with its striking double dome, was built in 1884 and houses orchids, palms, and tropical ferns. Inspiring free guided tours are offered Sunday at noon and 2:30.