Grand ___ UNESCO World Heritage Site in USA which was featured in the movie National Lampoon's Vacation crossword clue

The reason you are here is because you are looking for the Grand ___ UNESCO World Heritage Site in USA which was featured in the movie National Lampoon's Vacation crossword clue answers and solutions which was last seen today March 21 2021, at the popular Daily Themed Crossword puzzle. Clue: Grand ___ UNESCO World Heritage