(CNN) -- Summer is the quintessential season of leisure and fun. A time for adventure and exploration, summer is when long days consist of basking in the sun, catching fireflies in our hands, gazing up at stars and cheering with the crackle of fireworks. Ready for a mini vacation? To celebrate summer, CNN invited explorers to submit their favorite images of summer skies from around the globe. See some of the best user-submitted photos by exploring the gallery above. Do you have a passion for travel photography? Share your photos with CNN iReport and you could be featured on CNN.com. 50 states, 50 spots: Natural wonders . 53 amazing wildlife photos .
Sunsets, fireworks and starry skies remind us that it's summer . The first day of summer was June 21 in the U.S. Share your stories and images with CNN iReport .