Fastigiums are the highest point or peak of a building or structure, and are often referred to as the crest or apex. Other synonyms for fastigiums include summit, pinnacle, zenith, acme, climax, vertex, crest, climax, crowning point, top, highest point, peak, culminating point, and apogee. Each of these terms refers to the highest point of a structure or object, and can be used interchangeably with fastigiums in most situations. Whether discussing the peak of a mountain or the topmost point of a skyscraper, these synonyms can help to add variety and interest to one's writing.