How brilliant is this? Draw a path between two points in Google Earth and then select ‘Show Elevation Profile’. Hours of fun.
Here is my daily drive to work:

Here is my walk from my old flat to the university’s geography department. You can tell it’s Sheffield, can’t you:

Those are just two relatively short journeys, but you can do the same thing with whole countries or continents.
Here’s Scotland from south to north:

And here’s going over the Himalayas from south to north:

Like I said, hours of fun.
Notes