This world includes the dantdm classic lab on the world seed were he built the lab. it took me a few hours to build the main lab and to build the treasure room it took me 1 and half to 2 hours thank you to the reddit page r/minecraftseeds and the youtube channel Yqe for the world seed it comes with the secret treasure room from when DanTDM showed it first it might not be exactly the same but its the closes i could get to thee original treasure room it would be recommended to use the world on minecraft version 1.12.2 other wise it might not work properly but you can try and run it on newer versions but it would most likely not load the world with the original world land scape comment and tell me if you try it on a newer version and tell me if it works thank you and enjoy.