On these pages, you can learn about how to install and use the Routes plugin. A quick list of its features:

• Each post or page can have either a route or a single geographical point associated with it. Points in routes can included elevations and tag markers.
• Enter the routes or points via addresses, typing in latitude/longitude, clicking on a map, importing a GPX file, or a combination, on the post/page editing screen.
• Blog viewers see a Google Map of the route or point on the post/page screen, with tagged points marked, as well as overview maps on category/index pages.
• Optionally, create and display elevation charts of your routes.
• Search by exact city, state, country, or for the closest routes to a geographical point.

Visit the website for details and instructions.  Here’s the author’s website in action.