One of the valley’s all-time best places to explore, this 217-acre, landmark champagne estate has a wonderful old-world feel. Schramsberg is the label that presidents serve when toasting dignitaries from around the globe -- with a bevy of historic memorabilia in the front room to prove it. But the real mystique begins when you enter the champagne caves, partly hand carved by Chinese laborers in the 1800s, which wind for 2 miles -- reputedly making them the longest in North America. The caves have a Tom Sawyer feel, complete with dangling cobwebs and seemingly endless passageways; you can’t help but feel you’re on an adventure. The comprehensive, unintimidating tour ends in the tasting room, where you’ll sit around a big table and sample four surprisingly varied selections of bubbly. Tastings are $25 per person, but it’s money well spent. They are offered only to those who take the free tour, and you must make reservations in advance. Daily 10am-4pm. Tours and tastings by appointment only at 10am, 11am, 1pm, and 2:30pm.