In early builds of Ocarina of Time shown at Nintendo trade shows in 1996 and 1997, a fountain area appeared that no final player ever visited: the Unicorn Fountain, a serene water area with a unicorn statue at its centre and stepping stones leading to a chest.
The area was removed entirely before release, but references remain in the final cartridge’s data. Sound files tied to the Unicorn Fountain’s music cue were discovered by ROM hackers in the late 1990s, still present but unused.
The most likely explanation is that the Unicorn Fountain was a redesign of what became Zora’s Fountain — the peaceful area with Lord Jabu-Jabu’s Belly. The unicorn motif was repurposed into the Lord Jabu-Jabu model, and the fountain aesthetic carried over.
Beta content archaeology in Ocarina of Time has become its own discipline. The game shipped with numerous unused rooms, maps, and character models. The Unicorn Fountain is the most visually distinct of these cut areas — and the one that most cleanly shows how drastically the game changed in its final two years of development.

The attention to detail the developers put into this is insane. Most players will never see it but it makes the world feel so much richer.
This is the kind of discovery that keeps communities alive for years. Well documented.