I'm looking for some online resources that would allow me to select 10 locations (e.g., 10 cities or 10 landmarks in a city), and would return the time it takes to drive/walk/use public transportation between each pair of location. (i.e, the resource would return a 10x10 matrix where each cell i,j represents the time it takes to go from i to j).
I've used a route planner that accepts up to 25 places and shows the distance required to visit all of them driving. Lets you select many different routes, for comparison. Also lets you say how much time you want to spend in each place, for a total time estimate. And it lists each route in a format similar to a railroad timetable, so you can see how long each leg takes.