Tomb of Rassilon

The Dark Tower, which stands in the Death Zone on the planet Gallifrey (DW: The Five Doctors).

This is the tomb of Rassilon, where Rassilon lies in eternal sleep.Second Doctor

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.

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The Tomb of Rassilon inside The Dark Tower (DW: The Five Doctors)

The tower contained a crypt where supposedly resided the physical remains of Rassilon. 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. (DW: The Five Doctors)