This page is useful for planning walks or bike rides. It will calculate the route between two locations and will then also calculate the elevation of the route and display a graph to give you a feel for the hills on the way. Just type in two addresses or click two locations on the map and press the 'Get elevation' button. If alternative routes are available, they can be selected below. You can then drag the route around to see how it changes the climbs required. Unfortunately due to a change in Google Maps pricing, you must now provide a Google Maps API key to use this service.