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- Discovery and exploration 230
- Explorers 230
- Rapids 6
- Ice caves 4
- Waterfalls 4
- Glaciers 3
- Bridges 2
- Carriages and carts 2
- Cities and towns 2
- Cliffs 2
- Drawbridges 2
- Ferries 2
- Locks (Hydraulic engineering) 2
- Maps 2
- Paddle steamers 2
- Shipwrecks 2
- Steamboats 2
- Suspension bridges 2
- Trail riding 2
