This would be a great summer time activity because the voucher does not have to be redeemed until November

 Honor the past with this Groupon:

$10 for Admission and Walking Tour for Two (Up to $20 Value)

Group walking tours circle the grounds every hour on the half-hour from 10:30 a.m. until 3:30 p.m. Admission to the memorial also lets pairs wander at their leisure.

 (Children 6 and younger get free admission. Students and children younger than 18 get discounted admission, but this Groupon still represents the best value for adults)

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