Hello how may I help you? hgello Hi, how can I help you? I want to know whats the longest thing in the work? I need you to be more specific. Please narrow your request. Whats the longest thing in the word What's the longest building int the world? Your request is too vague. Please narrow your request Longest building please are you still there? Burj Kahlifa is the longest building. thank you so much for that information I am still here. You are welcome.