After inventing geometry and physics, Greeks invented history—primarily as a way to document their many inventions. Take a stroll through history with today’s Groupon: for $6, you get one ticket to The Civil War Veterans of Elmwood class, a walking tour on August 20 at 10:30 a.m. at Elmwood Cemetery (up to a $12 value).

Established in 1852 and listed on the National Register of Historic Places, the leafy and bucolic Elmwood Cemetery has acted as the final resting place for over 75,000 inhabitants, including 22 generals from both sides of the Civil War. Commemorate the 150th anniversary of the beginning of the war by thumb wrestling yourself or taking The Civil War Veterans of Elmwood class, a three-hour walking tour and an ideal way to spend time with friends or family or to meet fellow historical enthusiasts. Led by an expert volunteer guide, the tour winds its way around the cemetery and climbs each of its trees, teaching attendees about the prominent figures in the war buried at Elmwood, as well as the impact of the war on the lives of the men and women who experienced it firsthand.

Though Elmwood Cemetery sometimes features a discounted price online, this Groupon still offers the best deal available.