John Kavanagh The Gravediggers in Dublin is maybe the most classic Irish Pub on the planet. Since 1833, for the last eight generations, the Kavanagh household has actually been serving cold pints of Guinness to their patrons. Many say this is the place to get the best pint of Guinness in Dublin, which's stating something. The bar is called The Gravediggers because they share a wall with the Glasnevin cemetery, where more than 1.5 million Dubliners put…