Here are some shots showing the flight simulator outside world.

The simulator has every single air strip in the world.  There are also a number of highly detailed airports on the sim, some shown below.  Also, highly accurate weather modeling is available includeing real life weather.

St.Maarten (TNCM)

The famous Kai Tak (VHHX)

London Gatwick (EGKK)

Edinburgh (EGPH)

Salzburg (LOWS)

Tenerife North (GCXO)

Zurich (LSZH)

Frankfurt Main (EDDF)

New York JFK (KJFK)