Firstly , left click to go into your chosen photograph group.  When in the group by left clicking on any photograph it will enlarge. Where this gets interesting, click another photograph and this will come up as well. Hold the mouse over the photograph and press and hold left button. You can now move the picture around. In particular this is a great way to move photographs next to each other and compare.

South Shields riverside

Some photographs taken from over the river in North Shields