World Capitals by Capital City directly East in 90 seconds: with a map
To make a Capital City appear, type one that is East of it (but isn't more than 10,000 km away)
When you the type a capital city, any other ones that are reached by following a bearing between 240º and 300º, and is at most 10,000 km away, will appear, too
There's one city that will make 92 capitals appear