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This vintage postcard is focusing on Crystal Cave, a natural underground wonder located near Kutztown, Pennsylvania. The postcard highlights the cave’s 100th anniversary of discovery in 1871 and emphasizes its natural beauty and unique formations, such as stalactites and stalagmites. It also mentions that the cave is well-lit and easily accessible, with paved walks and no hard climbing required. The postcard invites visitors to explore the cave and mentions the presence of a souvenir and gift shop. Additionally, it provides general information about the cave’s location, geology, and facilities, including a free picnic park. The postcard also mentions the cave’s opening hours and the option for special or charter bus trips for groups.