Seventeenth-century shipping routes drastically improved once navigators began referring to actual maps of waterways instead of the veins on their thighs. Steer clear of veiny skin with today's Groupon: for $119, you get a spider vein treatment at Smith Vein Institute in Chardon (a $300 value).

The licensed vein specialists at Smith Vein Institute diminish the appearance of spider veins and root out the source of the problem using chemically based sclerotherapy treatments. Patients begin with an evaluation to determine whether treatment is right for them. Then, in a 20-minute session, the doctors inject unsightly veins with FDA-approved solutions that cause veins to retreat like pacifists playing Risk. Afterward, patients ensure spider veins don't return by wearing required medical-grade thigh-high compression stockings, available for $30 each (not included in Groupon). Approximately 70 percent of treated veins usually disappear per treatment, and the clinic recommends three to five total treatments to achieve optimal results. Sclerotherapy treatments are one of the least painful solutions for spider veins, and, as with shoulder-replacement surgeries for aging highways, no anesthesia is necessary.