A state in southeastern United States, North Carolina is known as the “Tar Heel State” and the “Old North State”. In the past five decades, North Carolina’s economy has undergone a transition from heavy reliance upon tobacco and furniture making to a more diversified economy with engineering, biotechnology, and finance sectors. North Carolina has a wide range of elevations, from sea level on the coast to 6 684 feet (2 037 m) at Mount Mitchell, the highest point in the Eastern US. The climate of the coastal plains is strongly influenced by the Atlantic Ocean and most of the state falls in the humid subtropical climate zone. The Appalachian Mountains attract several million tourists every year and is the most popular destination in North Carolina. However, other places are also popular with tourists, including a few spa resorts, which offers a great range of treatments.