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The Tomb of Rassilon, also known as the Tower of Rassilon or the Dark Tower, was a large tower in the Death Zone on Gallifrey.
The tower contained a crypt where the physical remains of Rassilon supposedly lay. It had three entrances: a front entrance, a door on the roof, and access from caves below.
There were a variety of obstacles and boobytraps which made the journey into the tower complicated. One trap involved stepping on tiles that coincided with the mathematical concept, Pi. A party of Cybermen failed to recognise the danger and were destroyed by lightning-like bolts.
The Third Doctor and Sarah Jane Smith avoided these traps by making their way to the top of the tower by climbing across a wire. The First Doctor was able to work out the puzzles and pass through them. The Second Doctor encountered an illusion of his former companions, Jamie McCrimmon and Zoe Heriot. He recognised this tas an illusion because the real Jamie and Zoe had no memories of their travels with him.
The First, Second and Third Doctors made their way to the tomb. After establishing a link for Borusa to transmat over, Borusa brought the brainwashed Fifth Doctor along with him, but the first three Doctors pulled the Fifth Doctor over to their side. Borusa, having tricked the Doctors, took the Ring of Rassilon, falling for Rassilon's ploy and was trapped within stone. (DW: The Five Doctors) It was some time before he was given his freedom. (EDA: The Eight Doctors)