21 Modern Day Unsolved Mysteries Across The World

There are some things in our world that we just cannot explain. They confuse us, make us question our existence, and even confuse modern science. Here are 21 mysteries that still exist in modern day:

1. Aliens

Do aliens exist? It is a question that many people are bound to ask, but few people know the answer to. We certainly have a lot of evidence that there is something out there, but what is it?