Facebook Photos & Images Size Guide – 2017. “1640px wide and 624px” is suggested as optimal for headers.
Removed the http://archaeologydataservice.ac.uk from JURN search, due to their being down for about a week now. I’ll add them back in when their servers return.
“brings together an incredible wealth of content including historical clothing and accessories, contemporary designs, catwalk photographs, drawings, sketches, catalogues and videos contributed by nearly 40 museums and fashion brand archives from 13 European countries.”