The Tennessee venue, being built in Cumberland County, is being constructed to FIA Grade 2 standard, which allows it to host any race series up to Formula 1.
There will be multiple configurations to the 5.9-mile, 34-turn circuit, including a 2.67-mile 'Grand Prix' track to host international competitions and a 3.5-mile private members venue.
It is due to open in 2024, with work under the guidance of the Tilke company having been under way for a year now.
The venue has made the most of the undulations of the Tennessee land it is built on – with there being a dramatic 30-degree banked turn, plus elevation changes on straights.
Source: Autosport