The phrase "rapt in wonder" suggests a deep sense of awe and enchantment in response to something remarkable or extraordinary. Synonyms for this phrase might include "captivated by marvel," "enchanted by awe," "mesmerized by wonder," or "spellbound by amazement." Other synonyms might include "enthralled by beauty," "entranced by fascination," "bewitched by enchantment," or "absorbed in admiration." Regardless of the exact phrasing, these synonyms all describe a state of fascination and wonder that captures the attention and imagination of the beholder, leaving them fully engaged in the experience and in awe of the world around them.