Little is known that the longest preserved fortification system after the Great Wall of China is the Walls of Ston. Ston is a small municipality with the same name settlement, situated at the beginning of the Peljesac peninsula in the vicinity of Dubrovnik. In the 14th century, the Ston became a part of Dubrovnik’s Republic. The Republic started to build a defensive wall around Ston to defend the whole area from hostile intruders. Originally 7 kilometers long, the Walls connected Ston and Mali Ston with their precious salt works. Today the majority of the walls can be walked around, and the salt work called Solana still works. Solana was founded in 1333 and is considered the oldest in Europe. Using in the production only the sun, the sea, the wind, and human strength, it gives limited amounts of exceptionally high-quality salt flowers.