A hallucination is a perception in the absence of external stimulus that has qualities of real perception. Hallucinations are vivid, substantial, and are perceived to be located in external objective space.
Construction begins on Poland's tallest tower by Foster + Partners. Work has started on a 310-metre-high Warsaw skyscraper by Foster + Partners, expected to become the tallest building in Poland. The Varso Tower, or Warsaw Tower, is now under construction on a brownfield site next to the Warszawa Centralna railway station, with completion slated for 2020.
Burj Dubai (The 'Dubai Tower') According to Wikipedia: Burj Dubai in Dubai, United Arab Emirates is currently the world's tallest man-made structure. As of 26 September 2008, the building, which is still under construction, stood at 707 m (2,320 ft). When completed, it is expected to rise over 818 m (2,684 ft).