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| Natural Bridge, Florida At Natural Bridge, the river sinks beneath the earth, then re-surfaces a few hundred yards later. Florida in this area has Karst Topology - a geological formation based on porus limestone. There is a monument to the civil war battle of natural bridge here, where a Union raiding party was turned back. Thus, Tallahassee is the only southern capitol that didn't fall to the Union. Category: bridge florida war civil battlefield natural karst
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