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Hi, Those are Google carousel results.  carousel results are results from Google’s Knowledge Graph. Please check below article for optimization. https://searchenginewatch.com/sew/how-to/2299454/4-google-carousel-optimization-tips Thanks

Since subdomains are treated as a completely separate domain, your options here are essentially to go with an aged domain with backlinks vs a fresh domain that will be "sandboxed" for a little while. Before someone yells at me for it, no, the Google Sandbox no longer exists but you will still see fresh domains rank nowhere for several months in most scenarios. With that out of the way, as long as moving those maps to the subdomain doesn't provide a poor UX then this is going to be your best option. Retain the strength you've already built and keep going from there rather than starting fresh. Just be weary of the potential for existing users who may have saved favorites or emailed links to the primary domain; you don't want them landing on a functional page that looks nothing like what they were expecting!