A plugin offering a widget showing recent photos in posts. It can be configured as for how many photos to show, the title on the widget and max width and height for thumbnails. The thumbnails links to the post where the photo is showing. They show a mouse over effect with bigger version of the photo in a tooptip. It has option to exclude photos from the view. It has only been tested with WP 4.2, it might work with lower versions.
