Olympus was a mysterious planet inhabited by the Olympians.
Astronomical data
The planets location was a mystery and how the TARDIS arrived there was by Prometheus using his powers on the TARDIS.
Landscape
The planets surface was lush with trees scattered around.
Settlements
The only known settlement was a huge city which on the outside appeared to be a huge temple. Here lived Zeus as well the other Olympians.
Natives
The native inhabitants of the planet were the Olympians who ruled it with power over all and from there the entire universe.
History
The Fourth Doctor and K9 Mark II was brought to the planet by Prometheus after freeing him. Once there they were brought to Zeus by Aphrodite where Prometheus was questioned over his actions of for stealing life spores and starting life in the universe. Eventually Prometheus escaped with the help of the Doctor and K9 and the three left in the TARDIS to unknown regions of the galaxy. (DWM: The Life Bringer)