The map includes different types of common utility poles from around the world. There is one location for each type of utility pole that per country. Full list of utility poles to help you learn can be found here: https://geohints.com/Poles

Utility poles of the world

Map includes every single type of bollard I could find around the world (one of each type for every country). There is also some snow poles, waystones, barricades and 2 trees. Full list of bollards can be found here: https://geohints.com/meta/bollards

Bollards of the world

The map includes top level country domains from around the world. There is one location for every domain, including non latin script ones. Full list of domain to help you learn can be found here: https://geohints.com/Domains . Thank you to everyone who has helped by sending locations in!