In small saucepan over high heat, bring water to boil. Remove pan from heat. Submerge tea bags. Steep 4 minutes. Discard tea bags. Let tea mixture cool 30 minutes. Pour into pitcher. Refrigerate 2 hours, or until chilled.
At serving time, add mint leaves to four glasses. Using muddler or wooden spoon, mash mint leaves several times to release juices. Don't mash into pulp. Add ice.
Stir white grape juice and lime juice into tea mixture. Pour into glasses. Garnish each with lime wedge and mint leaf.