Item #: XXXX

Object class: Euclid

Special containment procedures: SCP-XXXX is to be labeled as a restricted area with a cover story of a hazardous chemical spill. SCP-XXXX area is to be fenced off, with warning signs placed around the perimeter. At least 2 security personnel disguised as civilians are to monitor the territory around SCP-XXXX. No subjects are allowed in SCP-XXXX area unless otherwise provided by the experiment protocol.

Any unauthorized subjects detected within the SCP-XXXX area are to be treated with Class-A Amnestics and evacuated. All subjects confirmed to be within SCP-XXXX area for more than 2 hours before discovery are to be treated with Class-B Amnestics and sent to Site-███ for further study. Foundation web-crawlers are to monitor the internet for mentions of SCP-XXXX, any information regarding SCP-XXXX's anomalous properties is to be edited or deleted.

Description: SCP-XXXX is a park measuring 2 hectares, located in ██████████, California. Upon entering the park territory, subject aged 18 or over will experience a feeling often described as "nostalgia". While in this state, subject will remember various events from their youth or childhood and demonstrate highly accurate long-term memory. Affected subject will claim that most of their memories are somehow associated with SCP-XXXX or some element of its exterior1

While in SCP-XXXX, subject also has tendency towards discussing different events from their childhood or from the past in general with other people. It is worth noting that events described by subject in this state are always overly positive and optimistic, no negative comments are made. This also applies to individuals who demonstrated a deep dissatisfaction with their childhood before entering SCP-XXXX. If reminded of unhappy or tragic events that took place during their childhood, subject will ignore them or try to change the topic. SCP-XXXX's anomalous influence disappears upon subject exiting its area.

If not persuaded, affected individual will not leave the park before the beginning of the second phase (first 2 hours after entering). After spending more than 2 hours in SCP-XXXX, subjects begin to experience a rapid rejuvenation of all biological systems. This process typically lasts from 30 minutes to 4 hours depending on the subject's current age, visually it is described as subject "ageing backwards", and is confirmed to be unharmful and almost entirely painless to the individual. At the end of this process, subject's organism will become biologically identical to those of 10-12 years old children. Their appearance, state of health and all physical parameters will become identical to those they had in this age.

Subjects will remember all the events from their past, including the transformation itself, which will cause an expected psychological distress. After the beginning of the process, the process becomes irreversible. When the transformation is completed, subject's natural ageing process will completely stop. Currently, there is no known way to revert the changes or to resume subject's ageing process after those events.

It is confirmed that SCP-XXXX's anomalous influence only affects Homo sapiens, any other members of flora or fauna will not experience any of the aforementioned changes.

Addendum XXXX.1: A series of unanomalous inscriptions were discovered to be engraved into stones or carved into trees in various locations within the SCP-XXXX territory. All of them are currently believed to be created by the same individual. Full set of aforementioned inscriptions is presented below.

LOCATION: The trunk of a centuries-old oak tree to the left of the park entrance
CONTENT: This is the place. Even after all those years, it still looks familiar, doesn't it? :)

LOCATION: stone near the main park alley
CONTENT: We used to run around so much on those roads. Still remember that time I tripped and hurt my knee, so it got really bloody. Still caught ya after that.

LOCATION: the internal side of a gazebo
CONTENT: I'll never forget your face after you found out that cherry pie you brought for us was half eaten by the ants. The pie was insanely delicious. Unfortunately, the ants weren't as good.

LOCATION: one of the rocks forming the entrance to a natural cave
CONTENT: Remember how I liked to hide in there, and that one time I didn't come out until it was totally dark outside and you couldn't find me and got all worried? It was really funny. Not for you though. :D

LOCATION: back of a park bench located near a natural slope
CONTENT: …That time we saw a shooting star. You told me that if I'll wish with all my heart while looking at it, my wish will come true. You said that's magic. (∩ ͡⎚ ͜ʖ ͡⎚)⊃━☆゚.*

LOCATION: one of the rocks forming the entrance to a natural cave
CONTENT: … And you didn't lie. You never did.

LOCATION: on the floor inside a natural cave
CONTENT: And now, I think I've found the way. Now everything will change. It'll be just like old times again. I promise.

Addendum XXXX.2: On 07\17\2018, a body in advanced state of decomposition was found at the bottom of the natural cave located within the SCP-XXXX area. It is confirmed that body belonged to 10-12 years old male individual who died from malnutrition. It has been speculated that subject either fallen or deliberately crawled into the cave, but could not leave it due to a sudden rock slide which made the exit unreachable. Subject's identity is currently unidentified.