Now you've mastered it I expect you will want to know how did such a strange name come into being? Well....
"The story goes back to the opening of the rail station at Llanfair Pwllgwyngyll in August 1848, as the temporary terminus of the new railway from Holyhead. Passengers alighted here for the ferry across the Menai, then continued their train journeys from Bangor station (on the mainland). The village prospered from its status as a rail terminus and from construction works nearby on the Britannia Bridge. Once the bridge had opened, in May 1850, there was no longer any need for long-distance trains to stop at Llanfair Pwllgwyngyll, which became a railway backwater overnight.
A local committee was convened to think of ways to encourage passengers to alight in the village, and came up with the idea of extending the village’s five-syllable name to create the world’s longest place name. The railway company went along with the ploy, and displayed the new name on the station."