The Mapparium at the Mary Baker Eddy Library

The Mapparium is a three-story, 30-foot stained-glass globe installed in 1935 inside the Mary Baker Eddy Library and restored for public viewing in 2004. Visitors walk through the illuminated globe and experience unusual acoustics-whispers can be heard clearly across the chamber-a feature often demonstrated in online videos. The Mapparium is a frequent subject of virtual tours and social-media posts about unique museum exhibits.