Dungeon crawlers are RPGs in which the player has to explore one or more dungeons, fight monsters one after another, looting treasure, advance to higher levels and so on. Usually, dungeon crawlers have simple storylines and linear progression. A lot of roguelikes can be described as dungeon crawlers. Popular dungeon crawlers are Diablo, Legend of Grimrock, Dungeon Master, Eye of the Beholder.
Some of the most popular abandoned "dungeon crawl" games: