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  2. Blue Hole (Castalia) - Wikipedia

    en.wikipedia.org/wiki/Blue_Hole_(Castalia)

    Entrance to Blue Hole. The Blue Hole is a fresh water pond and cenote located in Castalia, Erie County, Ohio, in the United States.From the 1920s to 1990 the Blue Hole was a tourist site, attracting 165,000 visitors annually at the height of its popularity, partly because of its location on State Route 269, about 7 miles (11 km) southwest of the Cedar Point amusement park in Sandusky, Ohio.

  3. List of satellite map images with missing or unclear data

    en.wikipedia.org/wiki/List_of_satellite_map...

    Some locations on free, publicly viewable satellite map services have such issues due to having been intentionally digitally obscured or blurred for various reasons of this. [1] For example, Westchester County, New York asked Google to blur potential terrorism targets (such as an amusement park, a beach, and parking lots) from its satellite ...

  4. File:The Famous Blue Hole, Castalia, Ohio (Date Unknown).jpg

    en.wikipedia.org/wiki/File:The_Famous_Blue_Hole...

    Publisher: Genuine Curteich-Chicago "C.T. Art-Colortone" post card, a trade name under Curt Teich Co., Chicago, Illinois Distributor: Geo. H. Tremper, Sandusky, Ohio Estimated Date: 1930-1940s Era: Linen Era Condition: Unused. The Blue Hole is a freshwater pond and was a tourist site from the 1920s to 1990 and had 165,000 visitors annually.

  5. List of sinkholes - Wikipedia

    en.wikipedia.org/wiki/List_of_sinkholes

    The Great Blue Hole, a giant submarine sinkhole, near Ambergris Caye, Belize. The following is a list of sinkholes, blue holes, dolines, crown holes, cenotes, and pit caves. A sinkhole is a depression or hole in the ground caused by some form of collapse of the surface layer.

  6. Iconic Blue Hole's shutdown is temporary, but business still ...

    www.aol.com/news/iconic-blue-holes-shutdown...

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  7. Scientists Are Planning on Plunging Into the World’s ‘Portal ...

    www.aol.com/scientists-planning-plunging-world...

    Known as Dean’s Blue Hole, this geological wonder located off the coast of Long Island is a staggering 663 feet deep, making it one of the deepest blue holes in the world and also an area ripe ...

  8. List of National Historic Landmarks in Ohio - Wikipedia

    en.wikipedia.org/wiki/List_of_National_Historic...

    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]

  9. Blue hole - Wikipedia

    en.wikipedia.org/wiki/Blue_hole

    The Great Blue Hole, located near Ambergris Caye, Belize Dean's Blue Hole, Long Island, Bahamas Watling's Blue Hole, San Salvador Island, Bahamas. A blue hole is a large marine cavern or sinkhole, which is open to the surface and has developed in a bank or island composed of a carbonate bedrock (limestone or coral reef). Blue holes typically ...