Kilmainham Goal is one of the most interesting places to visit in Dublin. Hop on hop off buses stop just outside the entrance so there shouldn't be any problem getting here. It is a guided tour so you probably will have to wait some time for it to start after entering, but you can look through an interesting museum while waiting. I would recommend the tour for people who already have a knowledge of an irish history. Because, while I had found it very interesting, my boyfriend who can't speak a very good english and who didn't knew anything about people who where doing their time here, was bored.
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