I found several of them on YouTube, so I couldn't resist giving you a journey around the world.
Kensington Roof Garden, London, United Kingdom (England)
Private rooftop garden, Korea
Private rooftop garden, Taipei, Taiwan
Shared garden on a multihome house, Sydney, Australia
Relax garden for bankemployees, Hongkong, China
Educational rooftop garden, East Oakland, California
Believe me, there are many more...