University of Phoenix Stadium occupies more than 25 acres and has 1.7 million square feet of usable space. (Miranda Perez/Special to SuperBowl.com)

Before the stadium was built, fans had the opportunity to send in photos of themselves to be displayed on the outside near one of the entrances. (Miranda Perez/Special to SuperBowl.com)

Except when hosting football or soccer games, the grass field rolls out of the stadium on an 18.9 million-pound tray, residing outside of the stadium. A few inches of water remain in the tray even while the field is in play to keep the grass moist. (Miranda Perez/Special to SuperBowl.com)

An eight-foot statue of former Arizona Cardinal Pat Tillman stands outside of University of Phoenix Stadium. Tillman ended his football career with the Cardinals in 2002 to enlist in the United States Army. He was killed in Afghanistan in 2004. (Miranda Perez/Special to SuperBowl.com)

University of Phoenix Stadium holds up to 72,200 seats, including 88 luxury lofts, three party loft suites and 7,400 club seats. (Miranda Perez/Special to SuperBowl.com)

The translucent "Bird-Air" fabric roof has two large retractable panels that uncover the entire field when opened. (Miranda Perez/Special to SuperBowl.com)

University of Phoenix Stadium was the first NFL venue to illuminate the playing surface exclusively with LED lighting. The Arizona Cardinals hosted the first-ever NFL game played under LED lights on Sept. 21, 2014 against the San Francisco 49ers. (Miranda Perez/Special to SuperBowl.com)