#2 Madison Square Garden (New York City, New York)

The mecca of Combat Sports has been the home of WWE ever since it's inception. Vince McMahon Sr. would run shows every month at MSG. Bruno Sammartino is believed to have sold out the Garden an astonishing 188 times.
The eternal home of the company has hosted each of the Big Four Pay per view more than once and the company has enjoyed tremendous success in the New York area due to its events in the Graden.
But the relationship between the Company and the Garden hasn't been good over the recent years with WWE holding some of its major events in the Barclay's Center in Brooklyn. Things soured to such an event that Garden was starting to entertain the idea of hosting Non-WWE Wrestling events which shocked the wrestling community as no company other than WWE, not even the mighty WCW have held events in the Garden.
The Garden recently announced that it will host the G1 Supercard produced jointly by New Japan Pro Wrestling and Ring of Honour next year during Wrestlemania Weekend.
But things aren't as gloomy as they might seem with the company recently hosting a live event in the venue recently. WWE has also announced they will be returning to MSG on Boxing Day (26th December) this year as the venue will play host to Smackdown Live. With this announcement, we see no reason why Summerslam can't return to its first home next year.