Door to the End of Mankind

​Origin
The true provenance of this door are unknown, as are how it came to have its effects. It is theorized to have somehow travelled around the globe, and is apparently the inspiration for Thomas Bailey Aldrich's text from the Ponkapog Papers in 1904 before somehow travelling all the way from Massachusetts to Ohio and being found at the residence of Frederic Brown in 1949, a year after he published his flash fiction story, Knock. In both the story and the text by Aldrich, there is a man, the last on earth, sitting alone, when he hears a knock or ring at the door.

However, due to it's unknown means of travel, and it's abilities, it's also been speculated that the door has existed long before Aldrich discovered it, and may have been responsible for disappearances or historical "visions of the apocalypse".

Effects
The door is capable of changing its appearance to match the current "look" of its era and location (i.e. it would look different in 17th century France when compared to 20th century California). This includes changing which side its hinges are on, what material it is made of (it can change into different kinds of wood, and even into metals used in doormaking), and whether or not it has a certain kind of knob.

The door can open both ways, and when entered from the outside, it opens to a world that matches the common appearance of the apocalypse (dilapidated and broken buildings, fog, smoke, etc.). Once the door is then closed, it can only be opened from the outside, potentially leaving anyone who enters stuck inside. Ocassionally, knocks can be heard from the "apocalypse" side of the door despite their being (presumably) nobody there.

Storage
Due to its unknown nature and potential risk towards living organisms, this door was stored in the Restricted Chamber by Agent Tovar.