The document contains 4 links to images of different types of buildings - a house under construction, a hospital, an office building, and an underground city. The images show the exterior and interiors of these structures.

2. http://thecostmeister.com/wp-content/uploads/2013/10/cost-of-building-a-house.jpg
http://www.houstonmethodistcareers.org/static/sites/www/files/images/sub/hospital -
photos/sugarland-hospital-photo.jpg
http://www.cagley.com/photos/office/TowerOaksOffice.jpg
http://geocachiker.files.wordpress.com/2007/10/underground_city_1.jpg