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Fallen trees spanned gaps e.g. between cliffs. People in the Stone Age used the trees to get to places.
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Planks were used to cross the width of a river back then.
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These are ancient bridges that are most common in the U.K. These bridges were built with long, thin slabs of stone to make a beam-type deck and with large rocks or blocklike piles of stones for piers.
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It was a bridge invented in Greece
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These were used at least 800 years ago. The bridge allowed men to take their horses to horse grounds for practicing fighting(as there was war going on back then)
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One of the earliest bridges to be built. It was built by the Romans, and it was the first beam bridge
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A truss bridge is a bridge whose load-bearing superstructure is composed of a truss, a structure of connected elements usually forming triangular units. The connected elements (typically straight) may be stressed from tension, compression, or sometimes both in response to dynamic loads
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A bridge in which the weight of the deck is supported by vertical cables suspended from further cables that run between towers and are anchored in abutments at each end.
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These aren’t considered bridges by many people, but it was invented by the Romans. It’s a road supported on a number of arches made out of stone.
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A cantilever bridge is a bridge built using cantilevers, structures that project horizontally into space, supported on only one end.
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These are more modern bridges. It’s a bridge in which the weight of the deck is supported by a number of cables running directly to one or more towers.