Chilly Kazakhstan Building Indoor City
Turkish construction firm Sembol has drawn up some concept plans which include Venetian-style canals and gondolas.
Sembol is currently completing work on a nearby entertainment complex called Khan Shatyr:
Richard Orange writes, "Khan Shatyr's upper zone has a tropical climate, with an indoor 'beach', water slides, wave machine and tropical garden. Lower zones have a monorail system, a running track, a small amusement park, and a shopping complex. The Indoor City will take the same concept to another scale."