When you buy a house from the owners of a patio design company, you’ve gotta hope for an interesting house. Redditor kyky05 got one — that’s how his house came to have a built-in stone staircase/koi pond leading to the downstairs rec room.
Don’t worry — there’s a normal staircase, too.
Step down the steps and around the corner, and you’ll find the stone stairs lead you down through a cave-like arch, past a l’il fish pond, and into the basement. No handrail, though, so maybe you shouldn’t use this staircase if you’ve had a few to drink.