Magellan Castle orbited the planet Venus, and in the manga it was the palace of Princess Venus, given to her by Queen Serenity when she was born. Sailor Venus described the castle as being surrounded by sulfur fog. According to Artemis, it floated over the land of Aphrodite.
In Act 41, the Solar System Senshi called upon the power of their castles and directed it to the Rainbow Moon Cálice, which gave Sailor Moon the power to transform into Eternal Sailor Moon. In Chapters 1 and 15 of the Codename: Sailor V manga, the palace was shown as Minako was told of and remembered her past life.
- Magellan Castle's name is derived from the name of a space probe sent to explore Venus in the 1990s.