A few hints ...

Markers: Hover on the markers and click on them. Alternatively, bring the markers to the center of the map. This will open a popup.

Popup: click on to view the images in that gallery.

Popup: click on to center the map on this point (useful if you want to zoom in).

Popup: click on or on the map to close it.

Sidebar: click on to select another list of images.

Sidebar: click on to show the list of images. The nearest to the center of the map comes first. Click on an image to pin it on the map.

Sidebar: click on to show the list of images. The first (most recent) in the list comes first.

Sharing: the link of the browser is changed by all your actions. You can share the link to show the state of the map.