Well-known features of the palace include forbidden passages that led to the Space-Time Door, the Chamber of Prayer which housed the Crystal Tower at the centre of the Castle, and the Holy Blade. The castle also had a highly advanced computer system.
The Moon Castle was destroyed and left in ruins after the attack of the Dark Kingdom. However, in the manga and Crystal, it was restored to its former glory by Sailor Moon's power after her final battle with Metalia.
In the live-action series, the Moon Castle was protected by a translucent dome of matter or energy surrounding it, that produced an artificial climate, signifying the advanced technology that existed during that period. In the Special Act, Queen Serenity sent the Legendary Sword from the palace down to Earth.