A village in Angelsey in North Wales, which has the longest place name in the UK.
"Saint Mary's Church in the hollow of the white hazel near a rapid whirlpool and the Church of St Tysilio of the red cave".
(Listed in the Guinness Book of Records (2002) for the longest valid domain name in the world! The internet allows a maximum of 64 characters for a domain name (including the .co.uk ending) and this name has exactly 64 !)
The name was also used in the 1960's cult film Barbarella (Jane Fonda) as the password for Dildano's headquarters.
<googlemap lat="53.237071" lon="-4.20639"> 53.223118, -4.206278, Llanfairpwllgwyngyll, Isle of Anglesey, LL61 </googlemap>