This study examines the effect of visitors’ characteristics, motivations and sense of place attachment on perceptions of authenticity at a cultural heritage site. Data were collected in summer and fall 2006 through an on-site survey questionnaire administered to a random sample of visitors to Canyon de Chelly National Monument, Arizona ( n = 379; 76% response rate). The most important motives for visiting were ‘To enjoy nature’ and ‘To experience Navajo culture’. Additionally, visitors perceived a strong sense of place identity but a weaker sense of place dependence. Preservation of the archaeological resources was the most important contributor towards an authentic experience, followed by learning about customs and values of local people, meeting local people and visiting with an authorised Navajo guide. Attending interpretive programmes contributed the least. Results show that motivation to experience Navajo culture, the place identity dimension of place attachment, educational attainment, age and past experience at the monument had significant effects on the perception of an authentic experience at the monument. Place identity emerged as the strongest predictor of perceptions of authenticity, suggesting that a strong emotional bond is an important factor in visitors perceiving a site to be authentic. As visitor motivations for learning about the Navajo culture increased, so did perceptions of authenticity. Higher age also led to increased feelings of authenticity. As education levels and prior experience increased, perceptions of authenticity decreased.