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

The Crystal Bucephalus was part restaurant, part time machine. It was situated on New Alexandria and took its diners to famous events in history; by lowering the diner's reality quotient, they could be sent into the past to eat at fine restaurants without causing alterations in history. It was designed and built by Alexhendri Lassiter.

The restaurant was once visited by Turlough and the Fifth Doctor. (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...)