Coasterpedia:On this day/05 21

2024	Water Slide, a body water slide manufactured by Aquarena, opens at PiKo in Rodange, Pétange, Luxembourg
2022	Fireball, a steel 4th dimension roller coaster manufactured by Ride Engineers Switzerland, opens at Adventureland in Farmingdale, New York, USA Wacky Worm, a steel kiddie roller coaster manufactured by Levent Lunapark, opens at Leisure Island Fun Park in Canvey Island, Essex, England, UK Summit Plummet, a body water slide manufactured by ProSlide, opens at Splashway Waterpark in Sheridan, Texas, USA Texas Twist, a body water slide manufactured by ProSlide, opens at Splashway Waterpark in Sheridan, Texas, USA
2021	The Funplex Myrtle Beach opens with 3 rides in Myrtle Beach, South Carolina, USA Emmet's Flying Adventure - Masters of Flight, a flying theatre ride manufactured by Brogent Technologies, opens at Legoland Billund in Billund, Syddanmark, Denmark Reodor Felgen’s Hyperakselerator, a simulator ride manufactured by Simworx, opens at Hunderfossen Eventyrpark in Fåberg, Oppland, Norway
2017	Whistle Punk Chaser, a steel kiddie roller coaster manufactured by Zamperla, opens at Dollywood in Pigeon Forge, Tennessee, USA Flying Cheetahs, an Aero Top Jet ride manufactured by Zamperla, opens at Drusillas Park in Alfriston, East Sussex, England, UK Hippopotobus, a Crazy Bus ride manufactured by Zamperla, opens at Drusillas Park in Alfriston, East Sussex, England, UK
2015	Magic Maya, a tube water slide manufactured by Van Egdom, opens at Attractiepark Slagharen in Slagharen, Overijssel, Netherlands MexiCone, a tube funnel interactive water slide manufactured by Van Egdom, opens at Attractiepark Slagharen in Slagharen, Overijssel, Netherlands Yukatime, a tube water slide manufactured by Van Egdom, opens at Attractiepark Slagharen in Slagharen, Overijssel, Netherlands
2011	Rocket, a steel roller coaster manufactured by Schwarzkopf, opens at Furuvik in Gävle, Gävleborgs, Sweden Zippin Pippin, a wooden roller coaster manufactured by Martin & Vleminckx, opens at Bay Beach Amusement Park in Green Bay, Wisconsin, USA Big Boa Falls, a tube water slide manufactured by WhiteWater West, opens at Zoombezi Bay in Powell, Ohio, USA Python Plunge, a tube water slide manufactured by WhiteWater West, opens at Zoombezi Bay in Powell, Ohio, USA
2008	The Dark Knight Coaster, a steel enclosed wild mouse roller coaster manufactured by Mack Rides, opens at Six Flags Great America in Gurnee, Illinois, USA
2006	Nachtwacht-Flyer, a Star Flyer ride manufactured by Funtime, opens at Plopsaland De Panne in Adinkerke-De Panne, West Flanders, Flemish Region, Belgium
2005	Kingda Ka, a steel launched strata roller coaster manufactured by Intamin, opens at Six Flags Great Adventure in Jackson, New Jersey, USA SheiKra, a steel floorless hyper roller coaster manufactured by Bolliger & Mabillard, opens at Busch Gardens Tampa in Tampa, Florida, USA
2004	Revenge of the Mummy, a steel launched enclosed roller coaster manufactured by Premier Rides, opens at Universal Studios Florida in Orlando, Florida, USA
2000	Boulder Dash, a wooden terrain roller coaster manufactured by Custom Coasters International, Inc., opens at Lake Compounce in Bristol, Connecticut, USA
1999	Drop Tower: Scream Zone, a drop tower ride manufactured by Intamin, opens at Kings Island in Mason, Ohio, USA
1988	Ninja, a steel suspended terrain roller coaster manufactured by Arrow Dynamics, opens at Six Flags Magic Mountain in Valencia, California, USA
1987	Quik Cup, a TeaCup Ride ride manufactured by Mack Rides, opens at Mirapolis in Courdimanche, Île-de-France, France Caravelles, a sea storm ride manufactured by Mack Rides, opens at Mirapolis in Courdimanche, Île-de-France, France
1971	Walibi Holland opens in Biddinghuizen, Flevoland, Netherlands