The World's Oldest Castles

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Source/Further reading:

https://www.flickr.com/photos/trodel/...
https://photostockeditor.com/image/ar...
https://www.flickr.com/photos/alexxx-...
https://commons.wikimedia.org/wiki/Fi...
https://commons.wikimedia.org/wiki/Fi...
https://www.flickr.com/photos/2473621...
https://www.geograph.org.uk/photo/366...
https://commons.wikimedia.org/wiki/Fi...
https://commons.wikimedia.org/wiki/Fi...
https://commons.wikimedia.org/wiki/Fi...
https://en.wikipedia.org/wiki/File:Ki...
https://commons.wikimedia.org/wiki/Fi...
https://en.wikipedia.org/wiki/File:Ki...
https://commons.wikimedia.org/wiki/Fi...
https://commons.wikimedia.org/wiki/Fi...
https://commons.wikimedia.org/wiki/Fi...
https://commons.wikimedia.org/wiki/Fi...
https://www.geograph.org.uk/photo/619...
https://commons.wikimedia.org/wiki/Fi...
https://en.wikipedia.org/wiki/File:Ja...
https://uk.m.wikipedia.org/wiki/Файл:...
https://www.flickr.com/photos/dareang...
https://www.flickr.com/photos/e_phots...
https://en.wikipedia.org/wiki/File:Ho...
https://en.wikipedia.org/wiki/File:Ho...
https://www.flickr.com/photos/airport...
https://commons.wikimedia.org/wiki/Fi...
https://commons.wikimedia.org/wiki/Fi...
https://en.wikipedia.org/wiki/File:Vi...
https://www.veranda.com/decorating-id...
https://picryl.com/media/windsor-cast...
https://commons.wikimedia.org/wiki/Fi...
https://en.wikipedia.org/wiki/File:Wa...
https://en.wikipedia.org/wiki/File:Wa...
https://en.wikipedia.org/wiki/File:20...
https://commons.wikimedia.org/wiki/Fi...
https://ru.m.wikipedia.org/wiki/Файл:...
https://en.wikipedia.org/wiki/File:Re...
https://commons.wikimedia.org/wiki/Fi...
https://picryl.com/media/entrance-gat...
https://picryl.com/media/the-citadel-...
https://www.flickr.com/photos/paslott...
https://commons.wikimedia.org/wiki/Fi...
https://www.flickr.com/photos/200000/...

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