There's a site in Turkey, discovered in 1963, that has completely and irrevocably changed scientists' view on how civilization developed - the Gobekli Tepe. Essentially, they are the ruins of a civilization - complete with temples and huge structures - built over 7,000 years before The Pyramids and Stonehenge.
The key to this is that it seems to completely change most historians view of how modern society came about - the Gobekli Tepe seems to indicate that religion gave rise to agriculture, and not the other way around. But all of these findings are preliminary - in the 20 years archaeologists have been excavating the site, they have uncovered only about 5% of it.
No list of mystery places would be complete without some mention of a haunted house - and the Winchester Mansion fits the bill nicely. It begins with Sarah Winchester - a widow who owned a 50% stake in the Winchester Repeating Arms Company due to her recently deceased husband. After losing her husband and daughter, Sarah felt she and her family were cursed and sought out psychics and spiritualists for guidance. One told her that she was being haunted by the spirits of all who were killed by Winchester rifles, and the only solution was to build a house for her and the spirits. So she did.
She moved to California in 1886 and spent a huge portion of her inheritance purchasing and expanding a house - as the psychic had also informed her that construction must be continuous, or else she would suffer the same fate as her husband and daughter.
For the next 36 years, the home saw countless expansions - and given there was no plan in place for any of this, the house became insanely complex and maze-like, with stairways that went nowhere, doors that had walls on the other side, and hallways that were just dead-ends. Construction on the house only ended with the death of Sarah Winchester in 1922. The house now stands as an incredibly strange and ominous testament to the possibility of a world beyond the grave, and why you should never get real estate advice from a psychic.
In 1836, a cave was discovered outside Edinburgh, Scotland, that had something incredibly peculiar inside: 17 miniature coffins. Even more oddly, each coffin had a small (and incredibly creepy) doll inside, nicely dressed. Even odder still, all of the coffins were different. And that's all that's known about the place - no one who buried them, when they buried them, or - most importantly - WHY they buried them.
Some have theorized that the dolls were part of some kind of attempt at witchcraft, while others think they may have just been buried by a random oddball. Adding a weird note to both theories - about half the dolls had their arms removed, seemingly so that they would be able to fit inside the coffins. No one's sure what that might mean, or how that might help explain why 17 dolls were buried in a cave in Scotland, but some mysteries were not meant to be solved. Especially ones prominently featuring doll coffins.
It's hard to imagine anything as unsettling as finding a severed foot wash up on a beach. Luckily, the Salish Sea exists, so we don't have to - since 2007, FIFTEEN FEET have washed up on the shores of Canada and Washington state, and no one really knows why.
The first was discovered in August of 2007 by an American girl visiting Jedediah Island in Nova Scotia - and it wasn't just a foot, it was a foot still wearing a sock and in a shoe. Since then, more and more starting washing up, even as recently as May of 2014. In this time, there have also been several hoax attempts, but that shouldn't distract that 15 separate feet have been washing up randomly and without explanation.
The truly weird part of this is that no other body parts are showing up - while it's not that unusual for parts of a body (especially the extremities) to separate from the rest of the body when decomposing in water, it's INSANELY unlikely that ONLY THE FEET will start washing up in specific locations. Finding two feet in this small of an area carries one in a million odds - 15 is outside of any reasonable measurement.
There are several theories as to what's going on - odd currents, a bridge that multiple people have committed suicide by jumping off, etc., but none carry a significant amount of evidence behind them beyond a general hypothesis.
So the next time you're at a beach in the Pacific Northwest, watch your feet for...feet.
UVB-76 (colloquially referred to as "the Buzzer") is a notable location because, well...no one knows where it is. It's a shortwave radio station somewhere in Russia (or maybe somewhere else in Eastern Europe) that has been broadcasting on frequency 4625 kHz since the 1970s. Almost all of its broadcasts are short buzz tones, repeated endlessly 24 hours a day - except for rare occasions when the normal programming will be interrupted by a Russian voice transmission.
It's also notable because we know it's no longer in its original location - in September 2010, it switched locations and changed its identification code to MZDhB.
No one - at least, publicly - will admit what the station is or its intended purpose, although many have theories - ranging from instructions for spies to a way to confirm radio receiving stations remain alert at all times.
Whether or not the work being done by UVB-76 have been disrupted by the antics of a troublesome flying squirrel and moose are pure speculation, and will not be dignified here.