Possible minor bug: I searched for "New York, NY, USA" and it showed 41 maps of only Staten Island. I had to search for "Manhattan, New York, NY, USA" to get the maps I was looking for.
Thank you! It's actually a bit embarassing but my search uses the central lat,lng returned from Google's places API and then finds all intersecting maps. It's just not the right approach for a broad place based search. I'm in the process of integrating full geometry data globally from https://overturemaps.org/ as I type to fix this across the board and to use the definitive boundary geometry for the under-the-hood map lookups
Thanks for the report and for checking out the site!