Like Stonehenge, the first automobiles were marvels of engineering created primarily to pick up girls. Marvel at archaic achievements with today's Groupon: for $18, you get four general-admission tickets or four special-event tickets to the Gilmore Car Museum in Hickory Corners (up to a $40 value). Discounted rates are available based on age, and children 6 and younger are admitted for free.

Vintage vehicles have been motoring into the Gilmore's antique buildings since 1966, bequeathing their retired chassis to the museum's collection of more than 200 horseless carriages. The classic chariots reside in more than two-dozen relocated, reconstructed edifices, including eight historic barns, a re-created 1930s service station, and a Mayan pyramid no one remembers erecting. The retro rides are occasionally cut loose for driving demonstrations on the 3 miles of paved roads contained within the museum grounds, filling the ears of visitors with the thrilling thrum of yesteryear. The campus also houses several transplanted collections, including the Model A Ford collection featuring cars invented 19 letters before the Model T. Though not included with this Groupon, day-trippers can sustain themselves with lunch served at the pristinely preserved Blue Moon Diner. Surfeited seekers of knowledge may then head to the Gilmore Car Museum Library to gorge their brains on the pickled publications and preserved prints. The collection houses thousands of items and articles, including owner's manuals, parts books, and pinups of scantily clad cars. Plan ahead and catch a special event to see even more historical hot rods than are kept on site.