Inca bones
One of the Peruvian Skull

Another mysterious discovery by archaeologists i would really love to dive into is The Peruvian skulls found in Florida.

January 2012, during an excavation for a South Florida swimming pool by a plumber revealed two hideous looking skulls in the backyard which sparked questions of intrigue and murder but now researchers say that the origin of these bones are even more of a mystery than they initially thought. The two skulls was that of an Old man and a 10-year-old, which still had skin tissues on it after police investigations it was concluded that it wasn't just a normal murder crime or wasn't even a murder crime at all. According to Medical Researcher, Jan Garavaglia she said the bones had a feature of 'Inca bones' a telltale sign of a human from the Incan culture of Peru.

Research made out that the bones had a lengthier history of 30 years or more since it was found in Florida but examinations by the Medical Examiner's office revealed that the bones were atleast hundreds of years old judging by the mummified pieces of skin on the skulls. Jan Garavaglia said that the florida yard was obviously a secondary burial site.

With the help of some Archaeologists and Anthropologists from the University of Central Florida and Yale who tried to trace the origins of the skulls identified some cloth items found with the bones as that of primitive slings and purses made of woven materials and non-human hair even shards of pottery and textiles and shards of newspaper dating back to 1978

What researchers cannot figure out and Garavaglia says they probably will not be able to figure out is how the skulls ended up in Florida.

The mystery is how they ended up there in the first place and we don't have any way of finding out. She said

Reasons To the mystery? 
Dating back to 1030s and 1920s tourists on vacations may have bought them before laws regulated the trades of such artifacts but its no longer allowed. Another plausible reason, is that migrant workers from Peru may have brought them as a connection to their ancient heritage and decided to have moved on then they bury it either way, it's still very unclear if it was a murder back then, how bones dating back to 800 years ago had items of the early 90s buried with it and most importantly, how it ended up in a Floridian home back yard.
The mystery stone
The Mystery stone

Mysteries: another archaeological aspect of it though. I don't know why this particular unusual item reminds me of the historic Stonehenge.

Anyways, 1872 while construction for a fence post was going on at lake winnipesaukee, New hempshire. Seneca ladd, a Meredith businessman discovered the out-of-place Artifact(OOPart), although been actually seen by the workers he hired but he was given the credits for discovering it. A mysterious black stone of about 4 inches (100 mm) long and 2.5 inches (64 mm) thick, dark and egg-shaped, with some symbols carved around it. The stone's purpose, age or origin is still unknown. It was described as remarkable and a wonder of the scientific world. Nothing similar has ever been found anywhere in the United States to this day. It’s known as the “Mystery Stone.”

In 1892, upon Ladd's death, the stone was passed to Frances Ladd Coe of Center Harbor, one of his daughters. In 1927, she donated the stone to the New Hampshire Historical Society. The stone is currently on exhibit at the Museum of New Hampshire History. The carvings offered few clues as to the stone’s origins. The front of the egg shows a face. There’s an ear of corn on the side, a circle containing depictions of animal parts, a spiral, a crescent moon, and various patterns made of lines and dots with holes drilled into the top and bottom, In 1994, a borescope analysis of the stone's holes was performed by State archaeologist Richard Boisvert later suggested that the holes had the appearance of having been drilled by power tools from the 19th or 20th century but are too regular to have been created by pre–19th century technology, meaning the stone was crafted not long before it was discovered.

Reasons To The Mystery? 
Some theory suggested that the stone "commemorates a treaty between two tribes". A writer later suggested that it is a thunderstone. With the somewhat limited understanding of the day, the letter said that thunderstones "always present the appearance of having been machined or hand-worked: frequently they come from deep in the earth, embedded in lumps of clay, or even surrounded by solid rock or coral. The actual details of the stone’s discovery was not actually recorded and its still not clear about the exact site where it was found or how deep in the ground it lay before the discovery. The type of rock it’s made from isn’t usually found in New Hampshire. After close to 150 years of investigation, it's just clear that at some point in time someone created it for some reason or the other and it later ended up buried.
I would really love to hear your thoughts on this!