It’s a handcrafted, indoor treehouse adorned with tiny lights, spreading limbs and leafy branches. It also welcomes children for story time, games and a visit with a service dog named Dani. Children ...

Buzzwords like “glamping,” “eco retreats,” and “biophilic design” dominate today’s travel market — but before green everything was “in,” there were treehouse. From “Swiss Family Robinson”-style ...