US National Monument: Jewel Cave National Monument - South Dakota (1908)

Jewel Cave National Monument is located in South Dakota, and was established in 1908.

It is home to the third longest cave in the world and is one of the most decorated caves in the world.

The cave is known for its stunning array of calcite crystals, which sparkle in the light like jewels.

The monument offers a variety of activities such as ranger-led tours, cave talks, and hikes.

Visitors can also explore the surface of the park on the 1.3-mile scenic canyon trail.

The monument is open year-round, but warm weather is best for exploring the caves.

The park offers amazing stargazing opportunities, as it is located far away from light pollution.

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