A new homeowner said she found a pool underneath the "wavy" floorboards of her custom-built house. She said in a TikTok that she would turn the room into an atrium, but viewers didn't like the idea.

There’s no doubt that this townhouse in New York’s Upper West Side neighborhood was a standout when it was built in 1891, and now, more than 130 years later, the home remains a coveted piece of ...