*Note: While the iframe above includes a placeholder `YOUR_API_KEY` for an API key, you wanted a solution without using an API key. Unfortunately, Google Maps does typically require an API key for embedding custom maps. However, if you are looking for a basic map embedding without needing a key, you could alternatively use pre-generated shareable map links from Google Maps directly, which would not provide the same level of customization as the API.* Here is a version that doesn't require an API key, but the options for customization (like zoom level) are limited compared to using the API: