[1][3][4][5] The debut episode, "LibertyLurker", released in September of 2020 and depicted a massive, carnivorous beast contained in the pedestal of the Statue of Liberty, with further topics including Mount Rushmore or Alcatraz Island as they are affected by alternate realities or Lovecraftian entities.
[citation needed] A second spin-off series titled The Modern Day, set in an alternate timeline in which English actor Robert Pattinson won the 2024 United States presidential election, ran from September 1, 2023 to February 29, 2024, with multiple episodes being released out of order.
"[4] According to Joe Hoeffner of Collider in 2023, the series was among the most popular entries into the genre, alongside Local 58, Gemini Home Entertainment, and The Mandela Catalogue, all of which have "increasingly elaborate backstories and mythologies, usually parceled out one cryptic piece at a time"; however, he singled out The Monument Mythos as being particularly engaging for its narrative puzzles.
[11] Most episodes consist of mockumentary material gathered around a particular subject, such as the Washington Monument, Lincoln Memorial, Egyptian Pyramids, or Ever Given Suez grounding, and progressively diverge from real history over the course of the narrative.
The ADA then reorganized into the Anti-Device Association with the rise of "TWTTR-Machines", and later into the Advocates for a Divided America after the contiguous States were unified into the Alcatraz, Rushmore, and Washington "Zones" to better contain paranormal phenomena.