In ascending order:
By Robbie Shade (Flickr: Boston's Back Bay) [CC BY 2.0 (http://creativecommons.org/licenses/by/2.0)], via Wikimedia Commons
By Stefano Montagner  (via Flickr Creative Commons https://www.flickr.com/photos/stemonx/15296417146)
By Rick Berk (http://www.flickr.com/photos/rickberk/2848634125/) [CC BY 2.0 (http://creativecommons.org/licenses/by/2.0)], via Wikimedia Commons
Massachusetts Office of Travel & Tourism  (via Flickr Creative Commons https://www.flickr.com/photos/masstravel/10978505945)
Massachusetts Office of Travel & Tourism (via Flickr Creative Commonshttps://www.flickr.com/photos/masstravel/8530498123)