These photos were taken on the Twin Cities campus of the University of Minnesota.  Subjects of the photos include the Northrop Memorial Auditorium more information on the building can be found at the following website http://en.wikipedia.org/wiki/Northrop_Auditorium .  The Wall of discovery is also the subject of two of the photos and more information can be found on the following website http://www.alumni.umn.edu/Wall_of_Discovery.html . 

The last two pictures were taken in the Prospect Park in Minneapolis, the subject is called the Witch's Hast water tower, it is listed on the National Register of Historic Places.  The information from the national register of Historic places can be seen below:

Prospect Park Water Tower and Tower Hill Park (added 1997 - Site - #97001426) Also known as The Witch's Hat Water Tower 55 Malcolm Ave. SE, Minneapolis

Historic Significance: Architecture/Engineering, Event Architect, builder, or engineer: Cappelen, Frederick William Architectural Style: Late 19th And 20th Century Revivals Area of Significance: Education, Community Planning And Development, Architecture Period of Significance: 1900-1924 Owner: Local Gov't Historic Function: Industry/Processing/Extraction, Recreation And Culture Historic Sub-function: Extractive Facility, Outdoor Recreation, Water Works Current Function: Industry/Processing/Extraction, Recreation And Culture Current Sub-function: Communications Facility, Extractive Facility, Outdoor Recreation

From http://www.nationalregisterofhistoricplaces.com/mn/Hennepin/state3.html .