Most navigation systems emphasize visual landmarks such as buildings and bridges, while largely neglecting acoustic landmarks. Existing research has predominantly examined visual landmarks in real-world environments and acoustic landmarks in virtual contexts, leaving a gap in understanding the role of acoustic landmarks in real-world navigation. This study explores the potential of urban sounds as acoustic landmarks for pedestrian wayfinding. Eighteen participants completed a route-following task in an urban setting and subsequently evaluated a variety of characteristic sounds based on their identifiability, audibility, and usefulness for navigation. The results indicate that certain sounds, particularly auditory traffic signals for visually impaired pedestrians and traffic-related sounds, were perceived as especially helpful. In contrast, sounds such as conversations and fans were rated as less audible and less useful for navigation. These findings suggest that integrating carefully selected acoustic landmarks into navigation systems may enhance wayfinding support, particularly in contexts where reliance on visual information is limited, as was the case in this study.