20 casinos and counting... (in no particular order)

Circus Circus - manor and main building
Binions Horseshoe
Binions
Golden Nugget
Riviera
Bally's
Rio
Mirage
Treasure Island
Harrahs
Casino Royale
Terribles
Silverton
Arizona Charlies
MGM Grand
Plaza
Orleans
Tropicana
Lady Luck
Royal Inn

Hilton Grand Vacations
2 different Marriotts (non-casino)