When viewing a challenge map, you are able to tap on your pin on the map to open the My/Team activity summary feature.
From here you will be able to see the following things:
The distance you (and your teammates) travelled on a specific day (use the date selector) to the selected challenge.
See the types of activities that you (and your teammates) have posted to this challenge.
The content that you (and your teammates) have unlocked on the day selected.
A button that will take you to the street view of the area that you travelled on the selected day (note: this button will only show if street view is available on this portion of the journey).