I computed a 3D model of the Arecibo Observatory:

3D: http://s15.postimg.org/5czp6yi6j/are_04.jpg

point cloud: http://s21.postimg.org/3nvdz80vb/are_03.jpg

3D: http://s15.postimg.org/4lk04gwwb/are_06.jpg

point cloud: http://s23.postimg.org/4mrgn0daz/are_05.jpg

3D top: http://s30.postimg.org/6jfoha3fl/are_08.jpg

3D side: http://s30.postimg.org/3n6fm81r5/are_10.jpg

(based on Flying over Arecibo photos, see above)

a close-up 3D model: http://s2.postimg.org/4rblqbnwp/are_12.jpg

related point cloud: http://s2.postimg.org/pqdgt84i1/are_11.jpg

..based on 500 public photos, taken between 2000-2014 by tourists - sadly that means the receiver moved around. So if you can capture hundreds of photos please go and upload the photos on flickr.com