Here is a list of sceneries and add-ons for FS2004 and FSX we highly recommend to use in your Flight SImulator
Photorealistic scenery of Attica with a resolution of 4.8 meters per pixel. It covers an area of 2500 square kilometers of the Attica region, located in central Greece, where the capital Athens and Eleftherios Venizelos intl airport are situated.
Detailed FS2004 mesh terrain of Greece and surrounding territories based on SRTM Data (3 arcsec, 90m) and sampled to LOD9 resolution (76m). Unless you install "HSP Base scenery" (hspbase1.zip) for Greece, this Mesh Terrain may not interact properly with the Greek airports around it.
The "Base Scenery" is a set of changes & enhancements to airports and surroundings with the intent of a) correcting wrong entries by MS in respect to geographic locations airports and their objects and b) enhancing visually airports and places that were left very simple by default scenery. This scenery does not incorporate detailed custom objects per airport but rather a generic set of objects used by HST for scenery enhancement. Enhancement and corrective work has been done in 12 main airports, 30 secondaryairports, 10 airfields & airstrips and over 60 heliports all over Greece.