In Vegas there are cameras in the hallway. The only place where there are no cameras are in the restrooms and the hotel rooms themselves.
These 23 major Las Vegas Strip hotels have no surveillance cameras in hotel hallways or elevator landings, an AP investigation found:
Aria
Ballys
Bellagio
Circus Circus
Cosmopolitan
Encore
Excalibur
Flamingo
Harrahs
Luxor
Mandalay Bay