Excavations at the famed cathedral have uncovered remnants from the medieval ages to the Roman era.

In February 1959, a group of hikers died in the mountains. The events sparked theories both scientific and conspiratorial.

The material could withstand nuclear blasts, but hairdresser and amateur chemist Maurice Ward adamantly kept his formula close to the vest.

The German town of Echene was mentioned in medieval records, but then vanished from history.