From Nova Scotia to North Korea, a host of distinctive buildings are set to be unveiled this year, promising to make 2014 a banner year for architectural design. CNN takes you on a worldwide tour of some of the most extraordinary structures, including the world's first "invisible" tower, and a vertical city in the sky.Guangzhou Circle MansionItalian architecture firm AM Progetti has recently completed this round skyscraper, which has been dubbed "The Doughnut", in China's southern town of Guangzhou. The inner hole is unique in building design, and has a diameter of almost 50 meters. The architects say that they wanted to create a landmark building which would defy the western skyscraper stereotype, and were inspired by jade discs and numerological tradition of feng shui.By Milena Veselinovic , for CNN