Rob Adams, of Bellevue, Washington, built the fairy tale-like forest for his 6-year-old daughter, Lia, who loves reading books inside the trunk or climbing to the top for playtime.

The adventure starts at bedtime. Reach the master bedroom by crossing an open-air patio with metal open-fretwork flooring. It's a straight view down to the ground more than 20 feet below.

Mom creates whimsical fairy forest inspired by son with autism 02:41. If you walk around the Rahway Trail in the South Mountain Reservation of Millburn, New Jersey, you might spot more than leaves ...

Sometimes, Niecko will add to the fairy forest on the fly, based on comments she hears from visitors. “I heard a little kid yesterday go, ‘Oh, there’s the school.