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If you are looking for content focused on the naturist lifestyle or "nudist cities," there are several real-world locations and documentaries that explore this theme:

Whether captured through the lens of stock photography or experienced firsthand on a trail, the outdoor lifestyle reminds us of our primal need for connection to the earth. You can explore extensive galleries of landscape and nature photography to find inspiration for your next journey. Volume Six: Special Edition Artist Cover - Modern Huntsman

At its core, the naturist movement is about body positivity, freedom from societal judgment, and a return to a "natural state." Films that document this lifestyle often focus on:

While eNature and similar sites often categorize their content as "naturist" or "non-sexual," most mainstream platforms and search filters classify these films as due to graphic nudity.

The specific content you are likely referring to, from the domain eNature.net