NOTE: This feature is currently being rolled out to the playerbase, so not everyone has it at the moment.

Daily Challenges are unlocked after Level 71 and appear on the righthand side of the screen on the main screen: 

The Daily Challenge invites players to complete daily activities to unlock puzzle pieces. As they are completed, the puzzle pieces emerge, and eventually complete a snapshot from one of Wordsworth's travels. 

Tap on the icon to open up the Daily Challenge screen to see what challenges await: 

As you complete your challenges, you'll see they are updated here, and you can see your progress. In the image below, we see that one challenge has been completed in the puzzle piece, and another one is ready to be claimed: 

As you claim your rewards, you'll see your puzzle pieces put into place. Once you've completed all of your Daily Challenges, you'll be informed of how long you need to wait until the next challenge is available: