Blue Hole (Castalia)
The Blue Hole is a fresh water pond 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 southwest of the Cedar Point amusement park in Sandusky, Ohio.
Black Hole (roller coaster)
Black Hole was an enclosed steel roller coaster at Alton Towers in Staffordshire, England. It operated from 1984 until 2005. The coaster was located within a huge black tent (formerly green and yellow) that ensured the ride took place in total darkness. The coaster itself was a Jet Star II, designed by Anton Schwarzkopf. During the time that the ride operated, the park also operated a similar outdoor Jet Star III coaster, the Beast.