If you love to travel, take a look at my article on visiting the Grand Canyon. I highly recommend anyone who is travelling to L.A. to go visit it - it's in my home state of Arizona, but you can easily get a bus tour or rent a car and drive from L.A.
Here is an excerpt from the advanced level article:
As one of the seven natural wonders of the world, the Grand Canyon is an incredible formation like no other place on Earth. It a massive area at 27 miles (446km) long, up to 18 miles (29km) wide, and up to a mile (1.6km) deep.