When a public-smoking ban took effect in London in 2007, the Lanesborough’s Library Bar could no longer serve cigars. So the hotel set three umbrellas on a sunken outdoor patio and served cigars in the makeshift space. The spot became so popular that the hotel sought permissions to upgrade it. Opened in April with the proper permits, the outdoor Garden Room (www.lanesborough.com) features London’s only walk-in humidor. Guests can enjoy such rarities as a $2,500 Cohiba ‘Behike’ cigar alongside a $6,600 shot of 1770 Cognac.