As a high school teacher on a leave of absence to travel around the world, one of my goals was to visit as many schools in different countries during my sabbatical.  I managed to visit about 30 different schools in as many countries.  It was a very informative and a special treat to drop in and casually observe the daily routines and interact with teachers and students.  A precious and priceless experience for an educator.  
Outside, after school, students played and lingered.  One of my favorite photos was of a sister and brother relaxing together outside the classroom.