Attila, King of the Huns - the entire continent of Europe trembled in fear of this legendary leader. His life: victorious. His death: a legend. No one knows where he is buried. But there are some new clues. Researchers surmise the tomb of the legendary king is located in the Hungarian lowlands. Legends point us to his final resting place. Scientists and amateur researchers alike search for hidden clues - even under water. Accompanied by underwater archaeologist Attila Tóth, we set out on a journey to the depths of the Danube. Legend has it that Attila is buried under a river. Rock star Levente Szörényi, on the other hand, is convinced that Attila's grave lies in an old quarry. Spectacular experiments with weapons reveal how the Huns became a legend 1,500 years ago. Since then, his name has become shrouded in legend.

The Nibelungs - To this day, Germany's greatest legend still has modern treasure hunters under its spell. With the help of ancient scripts and divining rods, they set out in search of Siegfried's legendary golden treasure. The magical treasure, which is said to have been sunk in the Rhine, includes gold and silver, in addition to a cloak of invisibility. What's the story behind the myth? Scientists are trying to uncover the myth’s origins. The trail leads to Scandinavia where an archaeologist is looking for one of the saga’s oldest traces. A blacksmith tries to reforge Siegfried's sword using an ancient technique and conducts an experiment with the weapon. The discovery of bones provides an explanation for the dragon. Historians and linguists give insight into who the Nibelungs were and what the treasure might have looked like.

It promises power, wealth, even eternal life: The Holy Grail. The chalice of the Last Supper, in which Jesus' blood is said to have been collected, is one of the most important relics of Christianity. The National Socialists were already looking for him - in vain. Is the Holy Grail real or is there something else behind the myth? The historian and knight of the grail Dr. Michael Hesemann now claims to have found the true Holy Grail: The Santo Caliz in the Cathedral of Valencia. Together we go with Dr. Hesemann on the way of the chalice to the Spanish Pyrenees. Can the authenticity of the Grail be proven? Or does the trail lead to England, to King Arthur and his knights of the grail?

The Mothman - A creature as sinister as the devil himself. A black creature, two meters tall, with glowing red eyes and gigantic wings. This mysterious creature has been haunting the small American town of Point Pleasant since the 1960s. In 1966 and 1967 alone, over 100 people claim to have seen the Mothman. They still remember their encounter with horror and believe that the mysterious figure is a herald of disasters. The collapse of the Silver Bridge in 1967 with 46 fatalities would seem to confirm these fears. Could this winged creature actually be a messenger of doom, perhaps even a demon from another realm? Cryptozoologists and scientists are trying to solve the mystery. The increasing number of newspaper reports about the Mothman may have also fuelled the legend.

The Bermuda Triangle - to this day, countless myths and legends surround the infamous waters between Bermuda, Puerto Rico and Florida. For centuries, many ships and aircraft have disappeared there. What is behind these mysterious events? Pilot Bruce Gernon has first-hand experience with the myth. Flying his plane, he gets caught in a mysterious fog. The compass starts malfunctioning, making navigation impossible. U.S. freighter "U.S.S Cyclops", which disappeared without a trace in 1918, also made headlines. Its wreckage was never found. What happened to it? The Bermuda Triangle is known for its extreme weather. In a wave tunnel, researchers test the impact of monster waves. They can reach up to 30 meters in height. High enough to capsize a ship like the U.S.S. Cyclops?