Please allow me to post some takes on Burj Khalifa (currently the tallest building in the world) using the sigma 15mm fisheye. Thanks for viewing..

http://farm7.static.flickr.com/6074/6157759126_8a05307fc5.jpg

http://farm7.static.flickr.com/6161/6157758904_83ac07398e.jpg

http://farm7.static.flickr.com/6198/6157760458_4a9cf28031.jpg

with the Dancing Fountain

http://farm7.static.flickr.com/6166/6157215603_3696dd57c0.jpg

overlooking Dubai at 124th floor:

http://farm7.static.flickr.com/6159/6157213965_4e9428cb61.jpg

some more shots with the sigma 15mm fisheye

http://farm7.static.flickr.com/6073/6156091502_2ae26916d9.jpg

http://farm7.static.flickr.com/6201/6156089992_db4d38228f.jpg

http://farm7.static.flickr.com/6171/6155543103_7df6c4748d.jpg

Please feel free to share folks..