Where is a gas-sewage smell comin from my bathroom?

I had company over today. They used the bathroom and smelled nothing. Tonight I go into that room and the smell is overwhelming. No backed up toilets or bathtubs. I am on city sewage so no septic gases. I open a door under the vanity and the lines for another vanity are plumbed in (I have one single vanity) and the drain pipe is cut and not capped. I about passed out ! THE SMELL IS COMING FROM THAT PIPE. What is that and what do I do to squelch it? My house is for sale and I can't show it that way.

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