Bill Bucklew is over 3 weeks into his walk across the United States.

The Wilmette, Illinois native started his walk right after Thanksgiving in Tybee Island, Georgia.

He walks over 12 hours a day along Highway 80, on the way to San Diego, California.

It's why he is walking that is the best part. Bucklew has Parkinson's disease, so does his dad, and they believe his grandfather had it as well.

Bucklew is walking to raise money and awareness about the disease.

Always active, Bucklew used to rock climb, run marathons, triathlons, even completing an Ironman before this diagnoses.

Now, he walks more than he runs but keeps up with his active lifestyle. He says staying active slows the progression of the disease.

Bucklew can be tracked along his route here. He says if you feel inspired, or want to join in, then track him down and start walking.

His friend, Abbe Temkin flew down from Chicago to walk an entire day with him. She said they met 1 1/2 years ago at a marathon, both doing it for the Michael J. Fox foundation, which is dedicated to finding a cure for the disease.

Temkin's mom was diagnosed about 7 1/2 years ago.

Bucklew shared some of the stories he's heard from people that have walked with him.

One was when he stopped at a McDonalds. He told her his story and the next day she gets out of a truck where he was walking. She had bought him socks, trying to help him for what he is doing to help others like one of her family members.

Another woman met Bucklew in a bathrobe with medical tubing attached. She just had a double mastectomy. After seeing his story she knew she had to meet him and walk with him. They walked together for one block. At the end of it she told him that it's because of him, when she's healed from the surgery, she's running a marathon.

Bucklew wants to take stories like these and show the world how this disease can affect individuals and their families.

"At the end of this to have a mosaic of what the disease does to people across America and the different spectrums."