Hall of Fame second baseman Ryne Sandberg, who played 15 seasons for the Chicago Cubs, announced on Instagram that he has been diagnosed with metastatic prostate cancer and has begun treatment.

"To my Chicago Cubs, National Baseball Hall of Fame, extended Baseball Family, the city of Chicago, and all my loyal fans, I want to share some personal news," Sandberg wrote in the post Monday. "Last week, I learned that I have been diagnosed with metastatic prostate cancer. I have begun treatment, and I am surrounded by my loving wife Margaret, our incredibly supportive family, the best medical care team, and our dear friends.

"We will continue to be positive, strong, and fight to beat this. Please keep us in your thoughts and prayers during this difficult time for me and my family."

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It's very tough news for a pillar of the Cubs community. Sandberg was in Sioux Falls just last year at the HyVee/Sanford Legends for Kids banquet.

Sandberg, 64, was a 10-time All-Star during his 15 seasons for the Cubs from 1982 to 1997, amassing 282 home runs and 344 stolen bases. After his playing career, he served as manager of the Philadelphia Phillies from 2013 to '15, going 119-159.

He has been a fixture for the Cubs at spring training and Wrigley Field over the years, providing guidance for young infielders while being an ambassador for the team. He has appeared as a pregame and postgame analyst in various mediums as well.

"We cannot imagine how incredibly tough it is right now for Ryne and his family, but we do know Ryne is one tough competitor and a winner," the Cubs said in a statement. "We are rallying around his family with locked arms as they begin their journey to conquer this battle with cancer."

Sandberg won the National League MVP in 1984, the year the Cubs won a division title. He led the league in triples and runs scored that season while hitting .314 with 19 home runs. He also won nine consecutive Gold Glove awards.

In 1990, Sandberg hit 40 home runs, becoming just the third primary second baseman to reach the 40-homer plateau.

He was elected to the National Baseball Hall of Fame in 2005.

Sandberg and Cris Carter were the featured legends at the Legends for Kids event this past June, an event that has raised over 3.2 million dollars for youth sports initiatives since it began in 2005.

New Sioux Falls Residents are Moving from these 5 Cities

Before we get to the top 5, here's an honorable mention that's a bit surprising:

20) New York City: Sioux Falls gained 83 new residents in the latest census, according to Stacker.

Gallery Credit: Andy Gott

Seven Mind-Blowing Wonders' of South Dakota

I think most of us have at least heard of the "Seven Wonders of the Modern World." We might not be able to rattle them off as easily as McDonald's value menu items, but chances are you've heard of at least some of them, right?

There's the Great Wall of ChinaChichén Itzá, a Mayan City on the Yucatan Peninsula in Mexico. The ancient city of Petra, in Jordan. Machu Picchu in Peru. Christ the Redeemer Statue in Rio de Janeiro. The Colosseum in Rome, and finally, the Taj Mahal in Agra, India.

Every state in the nation is known for having a series of natural wonders and signature landmarks. So, I thought I would come up with my own list of the "Seven Wonders of South Dakota."

The following is what I consider to be the signature landmarks, monuments, and natural wonders that are synonymous with the great state of South Dakota. I tried to give both sides of the state a little love while comprising this list.

You might have a few additions...
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Let's get started. The Seven Wonders of South Dakota: