A Dubai-based architecture firm has proposed a concept that will redefine Dubai’s skyline. The architecture firm Znera Space has released a plan to install a giant ring-like structure known as the Downtown Circle around the world’s tallest free-standing structure – Burj Khalifa.The architects have proposed a giant ring of 550 meters in length around Downtown Dubai and Burj Khalifa. The circumference of this ring will be 3 km.