How to implement the display of office addresses on the map?

Question

Cartography

CMS wordpress. It is necessary to implement a selector with a choice of cities: City1, City2, City3 in the site header. And when choosing one of the cities from the list, the location of the office in this city was displayed on the main page on the map (Google / Yandex). Those. I think you need to declare all three addresses and execute the selector in the form of drop-down cities, but how to do it?
Or you can attach some kind of plug-in with maps with already given office addresses. Searched did not find.

Answer 1

This question is also interesting.