Seen here is the amazing “Flying Cathedral” by Jan Kaeser and Matin Zimmermann. The hot air balloon is a replica of the Abbey of Saint Gall, a Roman Catholic religious complex in the city of St. Gallen in present-day Switzerland. The Abbey has existed since 719 and has been a UNESCO World Heritage Site since 1983. [Source]

The photo was taken at Ballontage Alpenrheintal, an annual hot air balloon festival in Switzerland.