Rubuta ci gaba don wannan sakin layi - A halin yanzu akwai nau'ikan nune-nunen kasa da kasa guda biyu: Nunin Duniya (wanda aka sani da suna International Registered Exhibitions) da kuma Musamman na Musamman (wanda aka sani da suna International Recognised Exhibitions). Nunin Duniya, wanda aka sani da nunin duniya, sune manyan abubuwan da suka faru. A World Expos, mahalarta yawanci suna gina gidajen kansu. Saboda haka su ne mafi banƙyama da kuma mafi tsada expos. Tsawon su na iya kasancewa tsakanin makonni shida da watanni shida. Tun daga 1995, tazarar tsakanin Nunin Duniya guda biyu ya kasance aƙalla shekaru biyar. Nunin Duniya na 2015
an gudanar da shi a Milan, Italiya, daga 1 ga Mayu zuwa 31 ga Oktoba, 2015.