paulj wrote:
On Google Maps set the `terrain` mode to see where there are mountains. Zoom in to see details, all the way to Streetview.
Even better, download Google Earth. It's a little more clunky than Maps but once you select directions, if you right-click on the route, you can select "profile".
This brings up a graph of the grades along the route. Take bridge crossings with a grain of salt. If you see a really short very steep "V" its usually showing the ground level rather than the bridge but otherwise does a great job.
If you change to walking directions in Google Maps, you can get a profile but they often won't let you walk on freeways or they try to get you away from roads, so it's not as convenient.