It's summer and many of our readers are going on road trips to visit America's beautiful national parks, as seen in this recent slideshow. Can you guess which national park this photo was shot in?

Log in and leave your guesses below and check back here on Monday for the answer.

UPDATE 7/11/11: Both moretrends and MyFareFoodie guessed right. This photo is of the Lower Falls of the Yellowstone River in Yellowstone National Park.

Lyndsey Matthews is an online editorial assistant at Travel + Leisure.