How can I add valuable details (like insights, quotes, images and links) in a map, without making the map cluttered and still be able to get a nice overview? 

The answer is: Use sub-lanes and place your details in the sub-cards in this lane. That way you can hide details in your maps when presenting a high level journey, as well as drill down in the map when you need to get to the details. 

Here is how to show and hide sub-lanes

Click on the small triangle on each card to fold out the the sub-lane and sub-cards underneath. To hide sub-lanes, click on the triangle again. You can also hover over the side and then click on the text “show sub-lanes” 

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