A Reddit user was taken aback when he climbed through a “small square hole” into his attic and discovered an entire secret apartment.

The user, who goes by CatchingWindows, posted several photos of the “creepy,” decaying apartment, which looks like it’s straight out of a horror film.

“There’s a house in my attic…” CathingWindows captioned the original post, which has more than 18,000 upvotes in the r/interestingasf*** subreddit.

Inside the secret apartment upstairs, CatchingWindows said he found a bunch of junk: an old cabinet, a tire, a hat, a toilet and a sink, plus “lots of dirt” and “spiders”.

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Read more & see photos: yahoo