marvel at (someone or something)
To look at something and feel or express astonishment, wonder, or admiration. Every year, thousands of tourists come to marvel at the work of the brilliant architect. We've been marveling at your painting, John. It's absolutely incredible!
marvel at someone or something
Fig. to express wonder or surprise at someone or something. I can only marvel at Valerie and all she has accomplished. We all marveled at the beauty of the new building.
To be astonished or impressed by something: We walked through the carnival and marveled at all the rides and amusements.