Ancient cultures have left many relics and structures that have us guessing why, what and how. Even to this day some of the greatest creations of the past cannot be explained nor confirmed by modern science. We may have ideas, but nothing that is concrete. Maybe they were built just to mess with future generations? (LOL) Unlikely. Maybe there are links to our creation? Maybe they show us fascinating magic of our world that is often forgotten about? Possibly ET related? Here is a list of some discoveries I came across that are quite interesting. More on a fun lighter note.
For those who don’t get to the bottom, the source of the article is cracked.com. It is posted here with many edits. Edits made were edits to remove opinion, swearing, vulgar comments and racism from the originial article so that it would be more acceptable for our audience. Original article sourced twice for those who want to see the full.

#6 - The Voynich Manuscript

The Voynich manuscript is an ancient book that has thwarted all attempts at deciphering its contents. You may jump in and think this was just a series of scribbles thrown together for someone to figure out, but it’s not. It’s actually a well organized book with a consistent script, discernible organization and detailed illustrations.
It appears to be a real language–just one that nobody has seen before. And it really does appear to mean something. But nobody knows what.

Translation: “…and when you get her to put the tennis racket in her mouth, have her stand in a fountain for a while. Then draw pictures of her.”
There is not even a consensus on who wrote it, or even when it was written. So why can’t they solve it? Have a look at the picture and you guess is about as good as theirs.
To this date, expert military code-breakers, cryptographers, mathematicians, linguists, people who get paid to find and decipher patterns, have all been left unable to decipher a single word.
As you can imagine, proposed solutions have been all over the map. Some believe it is an unbreakable code that requires a key to solve while others suggest it is simply a hoax. Others believe it’s glossolalia, which is the fine art of speaking or writing something you don’t understand but that is being channeled to you by God or some other higher presence.

#5. The Antikythera Mechanism

The Antikythera mechanism is an ancient, intricate machine found in a shipwreck near Greece that dates back to about 100 BC. The Antikythera mechanism contains gears and structures that were not found in devices again for 1000 years.
No one has been able to figure out what it is to this point as no one can agree on where the Antikythera mechanism was made or who designed it. Popular belief was that it was made by the Greeks due to its instructions all being in Greek (about a million of our tax dollars were probably spent arriving at that genius conclusion) but serious research published in serious places suggested the design came from Sicily.
The mechanism, aside from placing you at serious risk for severing a finger, was supposedly used to figure out astronomical positions. The problem with that is that at the time this thing was made, no one had yet discovered laws of gravity or how heavenly bodies moved.
In other words, the Antikythera mechanism appears to have functions that no one alive at that time would have understood, and no single mechanical purpose of that era (such as navigating ships) explains the crazy number of functions and settings this machine has.

#4. The Baigong Pipes

In an area of China not known to ever contain people, let alone industry, there are three mysterious triangular openings on top of a mountain containing hundreds of ancient rusty iron pipes of unknown origin. Some of the pipes go deep into the mountain. Some of them go into a nearby salt water lake. There are more pipes in the lake, and more still running east-west along the lake shore. Some of the larger pipes are 40 cm in diameter, are of uniform size and are placed in what seems like purposeful patterns.
So what’s the big deal? Well, archaeologists have dated the pipes to a time when people were still trying to figure out how to cook meat without setting their back-hair on fire, let alone casting iron.
Oddly, the pipes are clean of debris despite being older than Zeus. This suggests that they were not simply shoved into the ground for the hell of it, but actually used for something. Oh, and did we mention the mountain is completely inhospitable to human life?
Some believe the Baigong Pipes to be an ancient astronomy lab or even spacecraft launching site left by extraterrestrials. This is possible, since the pipes contain a proportion of silica close to what occurs on Mars. Of course, the manhole cover outside your house does also, so this cannot be confirmed as truth. Whatever these pipes are and what their purpose was, they may very well have links to ancient alien theories which as we know some are faulty but many hold some fascinating truth.

#3. The Giant Stone Balls of Costa Rica

ballCosta Rica and a few surrounding areas are scattered with giant stone balls. They are smooth and perfectly spherical, or nearly so. Some of them are quite small, a few inches in diameter, but some of them are as large as eight feet in diameter weighing several tons. They have been chiseled to perfection by persons unknown.
Some of the balls have been blasted apart by locals hoping to find gold, coffee beans, or even babies. Some have been rolled around, but some are too heavy to move even with a bulldozer. About the most useful information anyone has gotten is that there are not, under any circumstance, any quarries anywhere near the balls. However this information is actually useless considering the balls are carved from volcanic rock.

#2. The Baghdad Batteries

batteryThe Baghdad Batteries are a series of artifacts found in the area of Mesopotamia dating from the early centuries AD. When archaeologists stumbled upon the batteries, they assumed they were just regular old clay pots for storage, but that theory quickly went out the window since they each contain a copper rod that shows evidence of acid corrosion.  This means that the pots probably contained a liquid that would interact with the copper and produce an electrical charge. If true, they predate the first known modern battery by hundreds of years.
Some stone reliefs called the “Dendera light” depict what some believe to be electrical arc lights, which would require something like the Baghdad Batteries to power. More reasonable types say the batteries may have been used to electroplate items with gold. Others say medicine men could have used the batteries to shock people.

#1. The Bloop

bloop
In 1997 that year, the National Oceanic and Atmospheric Administration recorded a strange sound in the ocean. Strange and LOUD. So loud that it was picked up by two separate microphones 3,000 miles apart. The sound, dubbed “The Bloop,” doesn’t sound like anything at normal speed. However, the NOAA did us the favor of speeding up the recording to 16 times the normal speed, causing it to sound like something dropping into a toilet…. Bloop! Except much louder of course.
Scientists determined that its wave pattern indicates it was made by an animal. The reason this is so difficult to place is because there is no animal big enough or loud enough to make that kind of noise, not by a long shot. This leaves them at a loss for words when it comes to the sound they are unable to place to anything we know that exists today. Check out the sound for yourself BLOOP