You may be looking for the novel of the same name.

The Crystal Bucephalus was part restaurant, part time machine on New Alexandria that took its diners to famous events in history.

The time machine was designed and built by Alexhendri Lassiter and it projected its diners through time. Turlough and the Fifth Doctor once visited it. By lowering the diner's reality quotient, they could be sent into the past to eat at fine restaurants without causing alterations in history. (PROSE: The Crystal Bucephalus)

Like the Capitol on Gallifrey, (COMIC: The Tides of Time, et al.) the Crystal Bucephalus and its complex sat inside a huge dome. (PROSE: The Crystal Bucephalus) The Mother and Father of the Shadow Spire saw Homeworld ruins on New Alexandria during the War in Heaven. (PROSE: The Story So Far...)

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