The new Nature Center under construction at Lexington's Raven Run Nature Sanctuary will be open to visitors from 4 to 6 p.m. Friday.
There will be a tour, progress reports, and light refreshments.
The building includes several green features, including passive solar heating and cooling, and geothermal energy. Rain that falls on the roof will be used to flush toilets.
Raven Run, the city's largest park, is at 5888 Jacks Creek Pike.