It’s no secret that the U.S. has some of the most beautiful landscapes crafted by mother nature. Nestled in the scenic highlights of America are trails that provide an up-close and personal look at the wonder and aesthetics that surround them. Many running trails serve as a mecca for running enthusiasts, as well as marathoners. Here we look at some of the most gorgeous, challenging, and popular trails in the U.S. and the races that are organized there. You may just find the next thing to add to your bucket list as you look at these 10 trails that keep runners and marathoners coming back year after year.