Halloween originated in Ireland and is known as 'Samhain Night'. The medieval Irish festival of Samhain marked the end of the harvest, bringing shorter days and the "darker half" of the year. It is linked to the dead revisiting the mortal world, large communal bonfires and associated lore. The largest organized Halloween celebration in Ireland is the Banks of the Foyle Halloween Carnival in Londonderry, from 27 to 31 October. If Halloween is your favourite holiday, then you should put this celebration down on your travel bucket list.