Google MyMaps Example
This page demonstrates embedding a Google MyMaps using an iframe. When embedding any iframe, you can first check to see if the default embed block will work (go to the block inserter and insert the Embed block).
If that fails, use the embed code from the website in an HTML block:

In order to make this map a wider width, it was added inside of a group block with the alignment set to “Align Full.”
This is an example of a global CTA
Supporting Text for the global CTA