The Crazy Fools UK Survival Server has several worlds for you to explore:
Overworld
Our current version of the overworld has been in place since 2014 and will never be reset again.
Explore vast lands, current, and past builds across the server. Find hidden bases or marvellous builds
Nether
The anarchy zone of Crazy-Fools.co.uk; griefing and PvP is permitted within the nether.
End
The end game zone of Minecraft