The Tomb of Horrors is a legend to some, a myth to others, and a lifestyle to the most worthy. The legends of the tomb go back before written time, and it is unknown when and if the tomb ever actually existed. However, due to its severe difficulty, many adventurers continue to spread new rumors and stories about the tomb's existence.
About
Dreamscape
It is said that the closest replica of the actual tomb was created by memories passed down from generations of mystics from one to another. Those who pass down these memories offer a service to willing adventurers, allowing them to 'visit' the tomb and train in the art of Dungeon Delving at minimal risk.
The Real Tomb
It is unknown how close the dreamscape tomb replicates the actual experience, as the location of the real Tomb is still yet to be discovered...if it still stands after all these years. One suspected location of the tomb is underneath The Bleak Academy in Skull City, miles below Quelmar in The Underdark.