Spikey Bridge is located at Swansea on the beautiful east coast of Tasmania.
Links and info from the web.
http://www.discovertasmania.com.au/home/local-tips/spikey-bridge
https://think-tasmania.com/spiky-bridge/
https://www.youtube.com/watch?v=u86f1SiYtsk
Historical Spikey Bridge Historic site, Tasmania, AUS