Yes; Beta 1.4 is available in the launcher if you choose the option to use old versions (create a new profile and choose the "historical" versions option - make sure you also change the game directory). You'll also need to set the date to April 1-5, 2011 (the Wiki makes it sound like the year must be 2011; any locked chests that naturally generate will remain unless you upgrade to a newer version, which causes them to have a missing texture and gradually disappear, or turn into stained glass in release 1.7 and later).
Possible to get the verson of minecraft with the Locked Chest april fools joke?
Yes; Beta 1.4 is available in the launcher if you choose the option to use old versions (create a new profile and choose the "historical" versions option - make sure you also change the game directory). You'll also need to set the date to April 1-5, 2011 (the Wiki makes it sound like the year must be 2011; any locked chests that naturally generate will remain unless you upgrade to a newer version, which causes them to have a missing texture and gradually disappear, or turn into stained glass in release 1.7 and later).
TheMasterCaver's First World - possibly the most caved-out world in Minecraft history - includes world download.
TheMasterCaver's World - my own version of Minecraft largely based on my views of how the game should have evolved since 1.6.4.
Why do I still play in 1.6.4?