Now that's what I call an expensive runway! 

In Portugal  A special airport

The airport's runway with a  length of 2781 meters (9124  ft.), of  which 1000  meters (3281 ft.)of the runway is supported by  180 pillars, each pillar  50 meters height  (about 17  floors),  surprisingly, the runway is designed  for B-747
Look at the cars parked below the runway

Spotted some construction photos here.

H/T His Eminence the Bishop