Also known as the Dead Zoo, the Natural History museum of Ireland has a firm place in the hearts of Dubliners. The building itself is a beautiful structure that dates back to 1856 and is filled with displays of skeletons and taxidermied animals. Little has changed in the years since it opened, which is why it’s often described as a "museum of a museum." Exhibitions are spread over four floors, although only the first two are currently open to the public due to a lack of emergency exits on the balcony levels.