3 Best Sights in St. Stephen's Green and Around, Dublin

Dublin's best-kept secret has to be this 1865 Ninian Niven–designed English Landscape walled garden that shockingly few natives seem to even know about. The architect showed off his dramatic flair in the rustic grotto and cascade, the sunken panels of lawn with their fountains, the blooming rosarium, and wonderful little wooded areas. This public park has no playground, but kids really love the "secret garden" feel to the place and the fact that the waterfall has rocks from every one of Ireland's 32 counties. Restoration of the gardens began in 1995 and has left the city with a Victorian treasure complete with a perfect box hedge and a working sundial. Access is from Hatch Street.

The country's leading learned society houses important documents in its 18th-century library, including a large collection of ancient Irish manuscripts, such as the 11th- to 12th-century Book of the Dun Cow, and the library of the 18th-century poet Thomas Moore.

A plain, neo-Romanesque granite exterior, built in 1868, belies the rich Georgian interior of this church, which Isaac Wills designed in 1720. Highlights of the interior include polished-wood balconies, ornate plasterwork, and shelving in the chancel dating from 1723—and still in use for organizing the distribution of food to the parish's poor.