Long before his legal entanglement with Marin County began, Lagunitas tea purveyor David Lee Hoffman went on a Himalayan trek that inspired many of the Tibetan-themed structures that officials have asked him to tear down. Now he’s exhibiting photographs from his journey that have been stashed away for more than 50 years—images captured in Dolpo, a northwestern corner of Nepal that is home to some of the most isolated villages on the planet. The pictures…