The oldest standing lookout tower in Karlovy Vary was erected on a popular observation point in the spa woods above the town in 1876. The Pseudo-Gothic brick lookout tower resembling a minaret with two lookout galleries was built as a copy of a lookout tower standing in Schleswig in northern Germany. The lookout tower was named after Emperor Franz Joseph and it was opened to the public in the spa season of 1877. The lookout tower also served as an arbour and after its opening, it soon became very popular among the spa guests. Fireworks were fired from the first lookout gallery at various festive occasions. Following World War I, the lookout tower was renamed to Josef's Lookout and it has been known as the Lookout of Charles IV since the end of World War II. In 2001, the unique historical structure underwent an extensive reconstruction.
http://www.karlovyvary.cz/en/lookout-charles-iv