This is a short ride from San Ignacio, but up the bumpy, unpaved road of Mountain Pine Ridge. You either need to have your own car or take a tour/taxi ride.
It was smaller than and not as varied as some butterfly houses I've been to, but the tour and information made it my best butterfly experience ever.
There is a local family that breeds and raises several varieties of butterflies and sells them all over the world. The most famous is the Blue Morpho, but they also have some interesting varieties, such as a small transparent-winged wonder.
We showed up without an appointment, walked over, and met the owner/guide. She showed us into her butterfly house and showed us all the stages of butterfly life, from mating to caterpillar to crysalis and hatching. We also discussed plants, food, and behavior. There are plenty of photo opportunities as the butterflies land on you, flutter around, or pose on flowers.
She also has a few tourist souvenirs to sell.