The largest fan event in the NFL's history is beginning to come into focus.

Below are the latest renderings of what is being constructed along the Benjamin Franklin Parkway in Philadelphia for the 2017 NFL draft (April 27-29):

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At the center of the "NFL Draft Experience" -- a festival that spans the length of 25 football fields -- is a 3,000 seat indoor-outdoor theater being assembled at the foot of the Philadelphia Museum of Art. This is the first time the league has built its own structure to house the event.

A number of activities will be offered for those unable to gain entry into the theater. There will be a 100-yard zip line; the "Combine Corner" where fans can run against NFL players on a 40-yard long LED wall; and a virtual reality center. The city was expecting about 200,000 people over the three days and an economic impact of $80-$100 million. They likely have to up those projections after seeing a 200 percent increase in fan registration from last year's draft in Chicago.