Mayasura* built three indestructible flying cities called Thripura.  One of iron on earth, one of sliver in the sky and one of gold in the heavens.  When the cities fell into wicked times, Lord Shiva destroyed the 3 cities with one arrow.  Mayasura was also the father of Mandodhari, the wife of Ravana who owned the flying Pushpak vimana.

Vishvakarma  was the divine architect.  He built the famous Pushpak vimana with which Ravana kidnapped Sita in the Ramayana.