Moki Sauna, a pop-up experience that debuted on Boston's Greenway last year, is back for early 2025 with new digs and perks at the Somernova campus in Somerville.

In the deepest part of winter, the nights are very long - 20 hours. Enough time and darkness for a chance, when the weather is clear, to admire the Northern Lights. Cross-country skiing at a leisurely ...