Sustainable development is a widely accepted strategic framework in city planning and urban green spaces have an important role in it. Beside, increasing empirical evidence indicates that the presence of natural areas contributes to the quality of life in many ways. Also, urban nature provides important social and psychological benefits to human societies, which enrich human life with meanings and emotions. In order to exemplify the importance of urban green spaces for sustainability this paper analyses some historical Persian gardens for environmental sustainability and citizens’ well-being. In this study, historical Persian Gardens were chosen due to their historical background as first sample of Iranian urban green spaces which are still being used successfully. Some results of a survey conducted among visitors of historical gardens in Iran are presented and discussed. The issues investigated people’s motives for visiting gardens and the emotional dimension involved in the experience of nature and its importance for people’s general well-being.