My first thought was Gander, but that's in Canada (duh!).

I think a lot of the misconceptions on global distances comes from the various way of mapping a sphere onto a flat surface - in spite of Mercator being intended for trans-Atlantic navigation - and this being very much a trans-Atlantic distance.

It might also be interesting to look at the closest US city to, say Seoul.

This reminds me of something I did as a school kid. I wanted to know the furthest place from home, so I wrapped a string around the equator of a globe, folded that length in half, held one end on top of my town - and discovered that there was a circle of "furthest away". In retrospect, I probably got that wrong, but other than the planet being an oblate, I can't think of what. Any ideas?