Nemrut (volcano) of the earliest trade routes. Two eruptions of Nemrut were probably witnessed by people of Urartu, an ancient state located in the eastern Turkey. These eruptions occurred c. 787 BC (period of King Menua) and c. 657 BC (period of King Rusa II), and the latter eruption might cause the sudden disappearance of the city Uaiais located 30 km east of Süphan. In the 1980s, Japanese volcanologists studied the evolution of gases inside the caldera of Nemrut. They found that the ratio of helium isotopes He/He is 1.06, which indicates volcanic activity (most of the measured helium evolved from the
Mount Nemrut the statues to fall in ruin. The site was excavated in 1881 by , a German engineer assessing transport routes for the Ottomans. After her first visit in 1947, Theresa Goell dedicated her life to the site, starting campaigns in 1954. Subsequent excavations have failed to reveal the tomb of Antiochus. This is nevertheless still believed to be the site of his burial. The statues, all of them "beheaded", have not been restored to their original condition. In 1987, Mount Nemrut was made a World Heritage Site by UNESCO. Tourists typically visit Nemrut during April through October. The nearby town