superstructure

Short definition from Wiktionary

Noun

1. 1
   Any structure built above the top full deck (FM 55-501).
2. 2
   Any material structure or edifice built on something else; that which is raised on a foundation or basis.
3. 3
   All that part of a building above the basement.
4. 4
   The sleepers and fastenings, in distinction from the roadbed.
5. 5
   The social sphere of ideology which includes religion, art, politics, law and all traditional values.