An over-the-top Long Island estate with an indoor lazy river, two-story built-in doll house and fountains inspired by those at the Peterhof Grand Palace in St. Petersburg, Russia, is listing for $100 million.

Located on about 8 acres in the village of Kings Point, roughly 25 miles from Manhattan, the waterfront compound includes a turreted stone mansion and two guesthouses that offer approximately 60,000 square feet of living space, 13 bedrooms and 35 bathrooms, according to listing agent Diane Polland of Coldwell Banker...