Calling all geography nerds: The Mapparium, the world's largest walk-in globe, is among the city's quirkiest landmarks. Located inside the Mary Baker Eddy Library, it’s essentially a three-story model of the globe built to scale. The perfect sphere runs 30 feet in diameter and can be crossed by means of a glass bridge that bisects its interior. Inside, sound bounces off the globe room's non-porous glass walls, amplifying it ten-fold—which means that whispered sweet nothings from your partner across the room register directly in your ear.
![Mapparium Mapparium, Sights and attractions, Boston](https://media.timeout.com/images/101593633/750/422/image.jpg)
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