Notable GT3 Racing Series

IMSA Sports Car Championship

The IMSA SportsCar Championship, currently known as the IMSA WeatherTech SportsCar Championship under sponsorship, is a sports car racing series based in the United States and Canada and organized by the International Motor Sports Association (IMSA). It is a result of a merger between two existing North American sports car racing series, the American Le Mans Series and Rolex Sports Car Series. The series has a class for GT3 Cars, and hosts events at many famous tracks in North America. Source: Wikipedia

The layout of Road America, a track on the IMSA calendar. Road America was opened in 1955 and is located in Plymouth Wisconson.

Sebring International Raceway is a tracklocated in Sebring, Florida. The most famous race it hosts is the 12 Hours of Sebring, which is one of the biggest races on the GT3 calendar.

Laguna Seca is another famous track on the GT3 calendar. Its noted for 'the corkscrew', one of motorsport's most challenging turns.

GT World Challenge

The GT World Challenge is a sports car racing series developed by SRO Motorsports Group and the Royal Automotive Club of Belgium. It features GT3 race cars and focuses on endurance racing. Endurance racing involves a team of drivers in one car attempting to complete a 12 or 24 hour race. Races are held at a variety of circuits throughout Europe.Source: Wikipedia

The Nurburgring is one of the worlds most infamous circuits with almost 13 miles of paved track. It has a reputation among drivers as one of the most demanding circuits in the worlds.

Spa Francorchamps is located in Belguium and is best known for its turn "Eau Reauge" where drivers will bomb uphill at speeds of 120+ mph.

The Autodromo Nazionale di Monza is a race track near the city of Monza, north of Milan, in Italy. Built in 1922, it was one of the world's first purpose-built race tracks.