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an open air concrete tank. The tank was built by Shell Oil to contain up to a million barrels of oil. When this was found to be inefficient it was abandoned, and it is now used as a recreational ground for public events. It also features the Holman House museum, originally in downtown Monahans, with an impressive exhibit of early 20th-century household furniture and artifacts.
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One of the most famous landmarks of the region, featuring sand dunes atypical even of the mostly desert Permian Basin. It offers camping, hiking, picnic grounds, and has a small museum and shop offering rentals of "sandboards" that can be used to ride down the sand dunes.