If you get roused up by the possibility of knowing where the best patty melt is, keep it "Hidden." That’s not exactly in-demand knowledge these days, but finding the Hidden Café, and knowing what to order is impressive nonetheless. Classic diner feel and greasy spoon grub probably keeps this place in business for regulars, as they’re not positioned for a lot of walk ins. It’s buried behind a business district off Main St. in Downtown Longmont. Maybe the patty melt is that good, so the owners want to keep things under the radar.