Round Rock is a city near Austin, Texas. It's known for its outdoor activities and historic sites. The Round Rock, a large stone in Brushy Creek, marks the site where wagons made low-water crossings in the 19th century. Nearby, Chisholm Trail Crossing Park has plaques detailing the city’s cattle-driving history. Old Settlers Park includes baseball fields, playgrounds, a disc golf course and a fish-stocked lake.