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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...16th-century castle and a Neolithic dolmen. Full review →
On a steep slope about 13km (8 miles) north of downtown, this 12-hectare (30-acre) garden was first planted in 1875 and is best known for its 2,000 varieties of rhododendrons. Full review →
Most of Howth backs onto the extensive grounds of Howth Castle, built in 1564 but much changed over the years, most recently in 1910 when Sir Edwin Lutyens gave it a modernist makeover. Full review →