Inside Facebook's futuristic new campus

Facebook employees have started moving into the main building at the company's new headquarters.

The new building is an expansion of Facebook's current headquarters in Menlo Park, California.

Designed by noted architect Frank Gehry - who also designed Los Angeles' Walt Disney Concert Hall and Spain's Guggenheim Museum - the new building is a massive project several years in the making. 

"Mark Zuckerberg and I met three years and a handful months ago, and with incredible speed for this size of construction project, he's moving into his building this month," Gehry said in a statement provided to Business Insider by Facebook. "From the start, Mark wanted a space that was unassuming, matter-of-fact and cost effective. He did not want it overly designed."

Employees officially began the move today, and though it's not yet complete, we've gotten our very first look inside.