Museum in Dublin
The National Gallery of Ireland on Merrion Square houses a collection spanning European art from the 13th century to the present, including works by Caravaggio (The Taking of Christ, discovered in a Jesuit dining room in Dublin in 1990), Vermeer, Monet, and Jack B. Yeats. Free. Budget travelers visit for free and see a Caravaggio masterpiece that was lost for 200 years, hanging in a free gallery in Dublin.
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Other places worth the walk, and what each one costs.
The Book of Kells Exhibition at Trinity College displays the 9th-century illuminated manuscript of the four Gospels, one of the most famous medieval manuscripts in the world. Entry is paid (includes access to the Long Room, a 65-meter barrel-vaulted library of 200,000 books and marble busts).
The Chester Beatty Library in Dublin Castle is a museum of manuscripts, miniature paintings, prints, and rare books collected by Alfred Chester Beatty, an American mining magnate who made Dublin his home. Free.
Christ Church Cathedral is Dublin's oldest building (founded 1030), a medieval cathedral with a massive crypt (the largest in Britain and Ireland), the tomb of Strongbow (the Norman warlord who conquered Dublin), and a preserved cat and rat found in an organ pipe (known as "Tom and Jerry"). Entry is paid at a modest price.
Free formal gardens behind Dublin Castle featuring a Celtic knot pattern laid out in planting beds. The name recalls the "black pool" that gave Dublin its name.
Dublin Castle was the seat of British rule in Ireland for 700 years, from 1204 until Irish independence in 1922. The exterior grounds and the Chapel Royal (with spectacular carved stone and oak interiors) are free.
Glasnevin Cemetery is Ireland's national cemetery, where Michael Collins, Eamon de Valera, Daniel O'Connell, and many other figures from Irish history are buried. Free to enter (guided tours are available for a fee).
Working out what Dublin costs?
The whole of Dublin