maps of big networks:
overview
http://submarine-cable-map-2014.telegeography.com/
http://www.telecomramblings.com/network-maps/international/
fibernets in .nl
- http://www.relined.nl (railway tracks + high voltage pylons)
- kpn: https://www.kpn-wholesale.com/en/our-products/data-networks/backhaul-services/d/dark-fiber.aspx
- eurofiber: http://www.eurofibergroup.com/include/en/content/Our_network2-GROOT.jpg
- eunetworks: http://www.eunetworks.com/network/ (13 european cities)
europe
- http://noc.eu.clara.net/
- http://www.edpnet.com/en/fiber-network (europe, russia)
BT