Llanfairpwllgwyngyllgogerchwyrndrobwllllantysiliogogogoch (or Llanfairpwllgwyngyll, for short) is a small town on the Isle of Anglesey in North Wales. It's on the road to Holyhead, where ferries connect to Ireland.
It is the longest place name in Europe, and one of the longest in the world.
According to Wikipedia, Llanfair Pwllgwyngyll was the original name. It was changed as a publicity stunt in the 19th century to Llanfairpwllgwyngyllgogerychwyrndrobwllllantysiliogogogoch