Flint Center structure. (MacRumors)

Apple is putting on its construction hat.

Apple’s big iPhone event on Sept. 9 looks to be one of the biggest in the company’s recent history. And to seemingly punctuate that point, the company is now apparently constructing a mysterious three-story structure at the site of the event.

The building, which is being put up at the Flint Center for Performing Arts in Cupertino, California, was first spotted by the folks at MacRumors, who received a tip from a reader with a photo of the site.

According to MacRumors, the building is surrounded by security personnel and is going up rather quickly. By the looks of things right now, Apple is either setting up a special display hall for its iPhone 6 and iWatch launch event, or the company is building a terrible misrepresentation of the Borg ship from Star Trek: The Next Generation.

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(CBS Studios, Inc.)

Could it be a massive showcase for Apple’s soon-to-be-announced products? Or perhaps a means for Apple to kidnap all the tech writers who constantly speculate about its every move? Who knows?!

The location of Apple’s Sept. 9 party is important for two reasons: It has a larger seating capacity than the places the company usually holds its events, and it’s the spot where Steve Jobs first introduced the Macintosh 30 years ago.

The Macintosh is one of the most important products in Apple’s history, which leads many, including us, to speculate that the company will be launching what it hopes to be another iconic device at the show.

Rumors surrounding the Sept. 9 event point to the launch of two versions of the iPhone 6, a 4.7-inch version and a 5.5-inch version. The iPhone 5s, for comparison, has a 4-inch screen.

Then there’s the iWatch. The device is practically folklore at this point, as its been rumored and discussed for several years. But based on the number of leaks and hints that have hit the Web in the past few months, we may finally see it in person.

We’ll be at the Flint Center covering the proceedings via liveblog and will have commentary on the announcements following the show. Check back with us for all your Apple news, and don’t forget to come back Sept. 9 for what is expected to be an interesting time, to say the least.

Email Daniel at dhowley@yahoo-inc.com; follow him on Twitter at @DanielHowley or on Google+ here.