Answer:
Obelisks, is the right answer.
Step-by-step explanation:
An obelisk is a stone four-sided column with a tapered tip appearing a pyramidion, placed on a pedestal, constructed to memorialize an individual or occasion and praise the gods. The origin of this architecture can be found in Ancient Egypt. The Egyptian rulers were the first to build such a monument. Over time the US government adopted the Obelisks in their architecture.