Curious Events Day: 10 of the World's Most Mysterious Mysteries

October 9 is not only Fire Prevention Day and Moldy Cheese Day, it’s also Curious Events Day! While the origins are, well, curious, this annual “holiday” celebrates the out-of-this-world, unexplainable mysteries.

Whether you believe in alien beings, mysterious creatures, out-of-this-world events or a host of conspiracy theories, some of the world's greatest mysteries remain unsolved. Or are they?

10 of the World's Most Mysterious Mysteries

• Bermuda Triangle - Many ships and airplanes have mysteriously disappeared in the Bermuda Triangle, an area of ocean located between Miami, Puerto Rico and Bermuda. Besides the countless ships and planes that have vanished over the years, an entire squadron of 5 Navy Avengers disappeared over the Bermuda Triangle on December 5, 1945.

• Pyramids – Without modern technologies and equipment, how were these massive ancient structures built?

• Stonehenge – This ancient site, touted as one of the world’s most impressive prehistoric monuments, is located in Wiltshire, England. While no one really knows why or how these large standing stones were erected without modern day technology, it is estimated 1 million people visit the site each year. Some speculate Stonehenge was an ancient burial ground, while others believe it’s a landing space for aliens. Some believe it’s a fertility symbol while others believe the monument has to do with the sun and the moon and astronomical events.

• Roswell UFO Incident - Whether you believe in little green men or not, what happened in Roswell, New Mexico, back in 1947, continues to be a great mystery.

• Crop Circles – 10,000 of these mysterious circles have been created in fields of corn, wheat or barley. Usually created in the overnight hours, some crop circles are simple circles while others are magnificent works of art designed in fields of grain! Could it be aliens creating these mysterious and magical designs? Could wind and/or rain be responsible? Could earth’s electromagnetic radiation or aircraft downdrafts cause the circles? Or is it a world-wide hoax carried out by crafty circlemakers?

• Loch Ness Monster – When it comes to monsters, the Legend of Nessie takes the cake! The Loch Ness is a lake located in Scotland. Nessie has been described as a dragon, prehistoric animal, monster fish and/or sea serpent lurking in the Loch. After spending nearly 30 years searching for Nessie, George Edwards spotted Nessie earlier this year and has the pictures to prove Nessie is much more than a legend.

• Bigfoot – Bigfoot is another one of the world's most legendary creatures. Able to run up to 30 miles per hour, the mysterious Sasquatch is estimated to be between 7 and 10 feet tall and weighs between 400 to 1000 pounds. Hair, not fur, covers the primate’s body. Fact or fiction?

• John F. Kennedy Assassination – November 22, 1963, marked one of the darkest days in American history. United States President John F. Kennedy was assassinated while riding in a motorcade in Dallas, Texas. Despite the Warren Commission’s findings that Lee Harvey Oswald was the lone gunman, Oswald maintained he was just a “patsy” and was shot at point blank range while in police custody. Despite the 5 million pages of assassination documentation, photographs, recordings and videos including the famous Zapruder film, many believe this tragic event was a conspiracy.

• Amelia Earhart - Female aviation pioneer, Amelia Earhart, disappeared without a trace decades ago. After departing from New Guinea en route to Howland Island on July 2, 1937, Earhart and her navigator, Frederick Noonan, simply vanished into thin air. Various artifacts and evidence may suggest the two may have landed on a remote island before dying.

• Jimmy Hoffa – On July 30, 1975, International Brotherhood of Teamsters leader Jimmy Hoffa disappeared without a trace. 7 years after he disappeared, he was declared legally dead. Authorities have been digging up all sorts of things looking for clues. Just a few weeks ago, investigators dug up a driveway in Michigan looking for Hoffa.