Heiligdom is one of the planets The Diamond Authority arrived tp as they were traveling through space on their vacation together. It's only ever visited once in Season 8.
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The planet is shown as a very fruitful, and thriving world full of alien life of all kinds. According to Sapphire, she and Pink Diamond played part in keeping the planet from being turned into another Gem Colony, but later events with the K-Bora hint that they were more responsible for the planet to become unsuitable for Gemkind.
Much of the planet is made up of thick jungles, open plains, and rocky outcrops.