Here's a list of 10 interesting facts about the world's tallest statue. An engineering marvel completed in a record time of 33 months, the world’s tallest statue—Sardar Patel’s statue or the Statue of Unity—will be inaugurated during a gala function on Sardar Vallabhbhai Patel’s birth anniversary on 31 October. Prime Minister Narendra Modi, who had laid the foundation stone for the project on 31 October 2013, will also be the one to inaugurate it on Wednesday.