10 Civilizations That Disappeared Under Mysterious Circumstances 8. The Turquoise Mountain Though not every crumbling monument represents a lost civilization, some of them do. Such is the case with the Minaret of Jam, a gorgeous architectural feat built in the 1100s as part of a city in Afghanistan, where archaeological remains suggest that it was a cosmopolitan area where many religions, including Jews, Christians, and Muslims, lived together harmoniously for hundreds of years.
The Colossal Head of Decebalus, King of the Dacians The project of sculpting the colossal head of Decebalus was the brainchild of a wealthy Romanian businessman, Iosif Constantin Drăgan. In 1985, Drăgan chose the rock to be sculpted, an outcrop 128m in height located in the area of Iron Gorge. Perhaps one of the reasons Drăgan chose this site was due to the fact that the Tabula Traiana, a memorial to the Roman conquest of Dacia, was located on the opposite side of the river.