Known for the mysterious disappearances of ships and aeroplanes.
An ancient text filled with strange illustrations and undecipherable script.
A low-frequency hum heard in certain locations around the world, with its source still unknown.
A strong, unexplained radio signal picked up by SETI in 1977.
A massive explosion in Siberia in 1908, believed to be caused by a meteorite, but some aspects of the event remain unclear.
A group of early English settlers in North America that disappeared without a trace in the late 16th century.