A ziggurat on Vadros IV
Internal structure
A ziggurat was a type of structure built in Iconian architecture.
One such building, constructed using neutronium, was located on Vandros IV. It survived the demise of the Iconian civilization and was still standing in 2372. (DS9: "To the Death")
Ziggurat-like structures could also be seen on an icon painting of the ancient Bajoran city of B'hala.