By the way, Angel Oak is the tree's proper name. It is not an angel oak; it is Angel Oak. On Wikipedia:
The Angel Oak is a Southern live oak tree located in Angel Oak Park, in Charleston, South Carolina on Johns Island, one of South Carolina's Sea Islands. It is estimated to be over 1500 years old, standing 20 m (65 feet) tall, 2.47 m in diameter, and the crown covers an area of 1,580 m² (17,000 square feet). Its longest limb is 27 m (89 feet) in length. The tree and surrounding park have been owned by the city of Charleston since 1991.
The Angel Oak is thought to be one of the oldest living things east of the Mississippi River. Acorns from the Angel Oak have grown to produce authentic direct-offspring trees. Live oaks generally grow out and not up, but the Angel Oak has had plenty of time to do both, standing 65 ft high and with a canopy providing 17,000 square feet of shade. Its limbs, the size of tree trunks themselves, are so large and heavy that some of them rest on the ground (some even drop underground for a few feet and then come back up), a feature common to only the very oldest lived oaks.