A WEEKLY SIGHTSEEING 

                                                         THE SKULL TOWER

                                                                (ĆELE KULA)

                                                                         In Niš

Source: http://www.crunchyroll.com/forumtopic-581713/the-6-creepiest-places-on-earth?pg=5

This monument is placed on the old Constantinople Road to Sofia. After the Battle of Čegar (1809), the order of Ottoman Sultan Mahmud II used the skulls of killed Serbs to make this monument.

Source: http://www.flyingoranges.com/entries/2007-03-27-Nis.html

It gained status of Monument of Culture of Exceptional Importance in 1979, and it is protected by the Republic of Serbia.

Source: http://tekstovi-pesama.com/cele-kula/0/124908

Source: http://www.panacomp.net/business_tourism?mesto=ehf-euro-nis