Google has dropped support for the location history dashboard. Alex Chitu first covered this explaining that the location history dashboard, that provides summaries of where you've been, has been discontinued.
A Google Maps Help thread has Google's community manager, Abby, explaining that the core location mapping data is still there but the summaries are gone. She wrote:
Thanks for your feedback on Location History and the Location History dashboard. I just wanted to jump in to let you know that you can continue to view and manage your Location History information by going to https://maps.google.com/locationhistory/, but we've removed the Location History dashboard (the part of the Location History website that provided a summary of your locations, including total miles traveled and trip information).
We are not removing Location History entirely or deleting any raw Location History information. We're continuing to explore more useful and relevant ways for you to engage with and view location history.
Alex has screen shots of the old dashbaord but now all you get is the ability to see specific dates or a record of the past 30 days or so.
You can access this at maps.google.com/locationhistory.
Google Now does give you monthly summary snapshots of miles walked and biked.
Forum discussion at Google Maps Help.