A view of Rome using Google Earth.

If you love maps and satellite images, and haven't downloaded the free Google Earth program yet, you really must.  The program draws from several different data sources to create a zoomable globular map of the world--in actual photo quality.  You can view the sand dune formations of the Sahara, the source of the Nile, the bogs of Ireland.  You can zoom in on buildings and warehouse in North Korea.  You can see for yourself the site of the Presidential Palace in Iraq.  You can see Thimble Island in Boston, a mere 60 feet across.

That's nothing.  Chances are if you live near a city you'll be able to see your car parked in your driveway.  And yes if you've always wondered where that gated driveway down the block leads to you'll now be able to spy on it from above. 
Google Earth works like a route planning program as well, and you can get directions, find hotels, and print maps.  Some cities and mountainous regions are topographical--meaning you can tilt the angle of your view and look at skyscrapers and volcanoes from the side.  You'll need a high-speed internet connection for this one, though, since the map data streams from the internet as you "fly" around.  Give it a try; you're sure to be intrigued for hours.  I still haven't gotten over it.