Danish architectural firm BIG (Bjarke Ingels Group) has unveiled a unique design for a 70,000 square foot observation tower in Phoenix, Arizona. “The Pin”, as the tower has been nicknamed, will stand at over 420 feet tall and feature a spiraling, spherical observation deck offering 360-degree views of downtown Phoenix. The tower will be built using reinforced concrete and will be accessible by three glass elevators. Like the Guggenheim Museum in New York, visitors to the tower will be encouraged to take an elevator to the very top of the structure and then make their way down the sphere and enjoy Phoenix’s spectacular views from open air platforms. The project is estimated to cost $60 million and will be Phoenix’s second tallest tower, standing slightly less tall than the 483-foot Chase Tower. For more renderings of the tower and additional information click here.