Kyoto

Halfway around the world, and the waypoint that exists to break something specific: the antimeridian.

Longitude runs from -180 to 180 and then starts again, so a leg that crosses that line has endpoints whose numbers suggest a journey the wrong way around the entire planet. Naive code draws a line straight back across the map. Handling it is not a nicety — it is the difference between a route and a horizontal stripe.

Every seeded demo needs at least one case that hurts. This is the globe's.