| 21. | Concrete observation towers were built throughout the island to monitor the experimental launchings.
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| 22. | The town also features the only observation tower in Kronoberg County.
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| 23. | The tower is open to public as an observation tower of Nemunas valley.
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| 24. | It was built in 1890 as the replacement for a wooden observation tower.
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| 25. | The summit features columnar jointing and was once home to an observation tower.
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| 26. | The observation tower was recently closed by the Wisconsin Department of Natural Resources.
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| 27. | On the summit, there is an observation tower built in 1913.
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| 28. | There is also an observation tower looking out over the dunes.
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| 29. | An observation tower at the summit marks the geoscientific importance of the mountain.
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| 30. | It also had a secondary benefit as an observation tower for the Army.
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