Texas has several natural features including Caddo Lake, the Rio Grande River which runs through Texas and Mexico, and bayous in the swamps. The landscape varies with hills and pine trees in East Texas, open land for ranching in West Texas, and the panhandle region in Northern Texas. Some notable man-made landmarks are the Alamo in San Antonio and Waco which was the first city to sell Dr Pepper. Texas has an interesting history of becoming the 28th state in 1845 and the Battle of the Alamo. Major cities include Houston which is the 4th largest city in America and Dallas which is known as the home of the Dallas Cowboys.