The Great Pyramid / Burj Kalifa ( not as ... as/ tall )
The Great Pyramid is not as tall as Burj Kalifa
The Empire State Building / Burj Kalifa (not as ...as / modern )
The Empire State Building is not as modern as Burj Khalifa.
The Geat Wall of China / The Great Pyramid (not as ...as / old )
The Great Wall of China is not as old as the Great Pyramid.