Established by the Royal Dublin Society in 1795 on a rolling 20-hectare (49-acre) expanse of land north of the city center, this is Dublin's horticultural showcase. The attractions include more than 20,000 different plants and cultivars, the Great Yew Walk, a bog garden, a water garden, a rose garden, and an herb garden. A variety of Victorian-style glass houses are filled with tropical plants and exotic species. Remember this spot when you suddenly crave refuge from the bustle of the city. It's a quiet, lovely haven, within a short walk of Glasnevin Cemetery. All but the rose garden is wheelchair accessible. There's free roadside parking outside the garden gates.