The concept of hot air balloon came out as a product of curiosity among human beings, considering the dilemma whether a balloon big enough in size can lift people to transport them. Ever since people began their journey of finding ways to fly in the air, hot air ballooning came out as an intriguing concept which later became quite successful. https://medium.com/@sky-waltz/flying-in-a-hot-air-balloon-once-in-a-lifetime-experience-3c2c8fa8fbeb