The Legend of Zelda: Ocarina of Time is the favourite of many, and a classic like this deserves maps with similar qualities. Peardian, a veteran user of VGMaps, decided to map the whole game in an amazing-looking isometric view. Oh, and spoilers ahead for those who haven't played the game yet.
According to VGMaps, he had to render the maps twice, both from top and side view, and it took him two years to fully map the whole thing.
Here are a few examples. The last one for Kakariko Village is my favourite, and the Water Temple looks like an entry level dungeon. But these are all superb, and great for a walkthrough.