A Time Museum was a museum that showcased exhibits concerning time travel, or objects from different eras of time.
Ian Chesterton was removed from his own time via time scoop, and taken to a Time Museum dedicated to various time travelling individuals and species. One of the exhibits concerned his own travels with the First Doctor. (AUDIO: The Time Museum)
The Second Doctor, John and Gillian visited a Time Museum filled with artefacts from different eras of history, including a ray cannon from the First Century Universe War and a mini rocket from 2150. (COMIC: The Time Museum)