I'm sure it came with the place. I don't think you build one on purpose.
When I came here, I tossed something into the pit. I still haven't heard it hit. And I. Have. Good. Ears.
"Chasm Death – “Expect a plagiarism lawsuit from Wile E. Coyote."
—Comic Book Guy, The Simpsons Game.
In this land of ours, there are many great pits, but none more bottomless than the Bottomless Pit. Which, as you can see here, is bottomless.
—Stan, Gravity Falls, "Bottomless Pit!"
Since it doesn't look like we're going anywhere - well, we are going SOMEWHERE, alarmingly fast actually. But since we're not busy other than that, here's a couple of facts.
—GLaDOS, while falling down one of these, Portal 2
Dr. Drakken: First, you will be sealed inside a reinforced, titanium box. Next, you will be dropped into this bottomless chasm. Then, the chasm will be filled with water. Then, man-eating sharks and a giant squid will then be released into the water!
Shego: Huh? Wait — if the chasm is "bottomless," how can you fill it with water?
Dr. Drakken: IT'S VERY VERY DEEP, ALL RIGHT?!?