A small selection of images of Omagh (OS square H4572) throughout the years - approx 13000 images to date http://www.geograph.org.uk/gridref/H4572
Adjoining squares OS H4472 - approx 1500 images http://www.geograph.org.uk/gridref/H4472
and OS H4672 - 1700 images http://www.geograph.org.uk/gridref/H4672