Flight options – see where you can get to from any airport
This is a fun site that lets you see where you can fly directly from any airport. For example, the flight map for Chicago (ORD) looks like this:
This can be really helpful if you are trying to see where you can go with direct flights. I was surprised to find out that the only place I can get to directly in South America is Brazil (the other 2 spots that look close are Panama City and Aruba).