There was an "immeasurably high" look-out post, "the Window of the Eye in Sauron’s shadow-mantled fortress", said to face Mount Doom.
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Barad-dûr (Sindarin "Dark Tower", sometimes given as The Barad-dûr (Lugbúrz in Black Speech)) is the fortress of Sauron in the heart of the black land of Mordor and close to Mount Doom in the fantasy world of J. R. R. Tolkien's The Lord of the Rings.
Mount Everest | Mount Vernon | Mount Kilimanjaro | Mount Pleasant | Mount Lebanon | Mount Athos | Mount Olympus | Temple Mount | Mount Fuji | Mount Rainier | Indiana Jones and the Temple of Doom | Mount Celestia | Mount Shasta | Mount Kupe | Mount Hood | Mount Holyoke College | Doom | Mount St. Helens | Mount Sinai Hospital | Mount Sinai | Mount Kenya | Mount Airy | Doom (video game) | Mount Vesuvius | Mount Rushmore | Mount Kosciuszko | Mount Carmel | Mount Barker | Mount Panorama Circuit | Mount Isa |
In 2954 Mount Doom burst into flame and those few farmers who remained fled Westward over Anduin, leaving only the Rangers behind to harry the servants of Sauron.
Coincidentally, prior to the naming of Doom Mons, a fictional mountain range of Titan already existed that carried the name "Mount Doom"; this was a major setting in the 1935 science-fiction tale Flight on Titan by Stanley G. Weinbaum.