The Michigan Triangle
Yes, the "Michigan Triangle" takes its name after the infamous Bermuda Triangle, but it's nos secret as to why. In 1937, Captain George R. Donner disappeared from his cabin on his ship. The door had been locked from the inside, and the porthole remained closed. This happened near a bizarre rock formation that was found at the bottom of the lake.
The Baltic Sea Anomaly
Even though this looks just like Star War's Milennium Falcon, the Baltic Sea Anomoly is quite real. It's a 60m-thick object located 90m deep in the Baltic Sea. Researchers have not confirmed that it's a shipwreck or a natural object, but radar has picked up drag marks on the sandy ocean floor. No one knows what it is.