The aerial photo above is from 1968, two years before the groundbreaking for Carowinds began. The state line is highlighted in yellow, and the portion highlighted above was an actual road (State Line Rd) back in the day. The red dots on each photo are the exact point in which the Carowinds Plantation House entrance was built. The X noted on the yellow line above and below is where Thunder Road crossed the state line. Note the construction of I-77 on the right side. The exact same view below is taken 10 years later in 1978. Fascinating!