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Location: Hinsdale, Ill.
Price: $2.55 million
Bedrooms: 4
Bathrooms: 4 full, 1 half
Square footage: 3,754

The ivy-covered Tudor 1932 exterior of this, uh, stately manor gives no hint that behind the house, the pool has an aquatic bat signal. Zillow reported that the sellers’ son was a Batman fan as a young lad, so they surprised the lucky boy when he was 3 or 4 by painting the bat symbol at the bottom of the pool. “A guy came out and freehand drew it, and they [the owners] just kept it over the years,” the listing agent Beau Carstensen told Zillow. “One of the son’s friends posted it on YouTube later, and that’s when it went viral.”