The Legend of Zelda series is famous for mixing a large, non-linear open-world with multiple dungeons, but in an interview from 1999 that has recently been translated by Shmuplations.com, the legendary designer revealed that the original game was very nearly "just dungeons."
In the interview – which is primarily focused on Ocarina of Time – Miyamoto is asked about transitioning the dungeons into 3D, and replies:
In every Zelda development, the dungeons take a huge amount of time to make. I can't tell you how many times they end up having to be remade and revised, while the team is on the verge of tears. Did you know, in the original Legend of Zelda, at the beginning of the development it was just dungeons. There was no overhead map. That's a testament to the "Dungeon Supremacy" philosophy we've always followed. However, with Ocarina of Time, for the first time we didn't spend as much time on the dungeons. It was a very a "un-Zelda" thing to do. (laughs)
Released in 1986, The Legend of Zelda first appeared on the Famicom Disk System before being ported to the NES in 1987.