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Jewel Cave National Monument contains Jewel Cave, currently the fifth longest cave in the world and second longest cave in the United States, with 220.01 miles (354.07 km) of mapped passageways as of May 2024. [3] [4] [5] It is located approximately 13 miles (21 km) west of the town of Custer in Black Hills of South Dakota.
U.S. Routes in Ohio are the components of the United States Numbered Highway System that are located in the U.S. state of Ohio. They are owned by the state, and maintained by the Ohio Department of Transportation (ODOT) except in cities.
This is a list of National Historic Landmarks in Ohio and other landmarks of equivalent landmark status in the state. The United States' National Historic Landmark (NHL) program is operated under the auspices of the National Park Service, and recognizes structures, districts, objects, and similar resources according to a list of criteria of national significance. [6]
County roads in Ohio comprise 29,088 center line miles (46,813 km), making up 24% of the state's public roadways as of April 2015. [2] Ohio state law delegates the maintenance and designation of these county roads to the boards of commissioners and highway departments of its 88 counties . [ 3 ]
Jewel Cave National Monument: Some public access [7] 3 Wind Cave: 266.8 km (165.8 mi) [8] near Hot Springs, South Dakota: Wind Cave National Park: Some public access, suspended as of May 2024 for elevator replacement [9] 4 Lechuguilla Cave
The locations of National Register properties for which the latitude and longitude coordinates are included below, may be seen in a Google map. [1] There are 25 properties and districts listed on the National Register in the county, including two National Historic Landmarks. Another two properties were once listed but have been removed.
In the background Herb's maps of the cave. In 1959, geologist, mountaineer and caver Dwight Deal had done some exploration in a small cave called Jewel Cave, a little known monument in the National Park System. He needed some companions who might help him continue his exploration trips there and turned to his friends, Herb and Jan.
In 1935 the Ohio General Assembly passed a law which added 5,000 miles of roads to the state highway system over a 12-month period. [7] [8] These roads were assigned route numbers in the 500s, 600s, and 700s. [9] In 1962 certain numbers were retired to accommodate numbers in the Interstate Highway System. [citation needed]