Adventure Lab Bonus Hide should be an easy find with paking nearby. 

Lewiston, Maine, features a vibrant and growing collection of public murals, largely driven by city grants and community efforts to beautify downtown, particularly in the Tree Streets neighborhood. Notable works include large-scale spray-paint murals, many of which can be viewed by a 1-mile walkable, self-guided tour created by LA Arts that highlights the downtown area.

https://labs.geocaching.com/goto/09c52dd0-455d-49cc-8e71-5d526ee06bca

Scan QR Code and this will bring you to the Murals of Lewiston Self Guided Walking Tour Adventure Lab.