Nazi military commander Heinrich Himmler's search for an Aryan race he believed came from the mythical underwater city of Atlantis. He claimed that while the city was lost under the sea, its inhabitants had fled to the Himalayas. However, the search for evidence to prove the theory would ultimately harm his peace of mind.

The story of Indiana-born treasure hunter Mel Fisher, who spent much of his life hunting for sunken Spanish treasure galleons off the coast of Florida. In 1985 he made the headlines after locating the 1622 wreck of the Spanish galleon Nuestra Senora de Atocha. However, his successes came at a high personal cost.

The story of amateur treasure hunter Adolph Ruth who set off into the Superstition Mountains, Arizona, in 1931 in search of the location of a rich gold mine allegedly founded by a German immigrant who never revealed its location. An expedition found his clothes containing a detailed map and a note indicating the explorer had succeeded in his quest, although his body was later discovered in a gully with two bullet wounds to the head.

South African councillor Athol Stark searches for missing gold buried during the Boer Wars with help from a Zulu family.

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For 2000 years, adventurers have been searching for the ship that, according to the Bible, saved Noah, his family and the animals from the great flood that God wanted to use to wipe out evil from the earth. In the last 50 years, the American creationists in particular have taken over the search. They believe that finding the Ark on Mount Ararat in eastern Turkey would be the ultimate proof that the theory of evolution is wrong and that every word of the Bible is true. The documentary accompanies three of these creationists on their perilous expeditions.

The Ark of the Covenant has been missing for over 2000 years. According to legend, it contained the power of God and was carried into battle by the Israelites as a weapon. In 1982, American Ron Wyatt claimed he found the Ark in Jerusalem, but he had neither witnesses nor evidence. Findings from recent excavations in Israel suggest that there may have been more than one Ark, as other portable shrines have also been called the Ark of God.

According to legend, the Egyptian god Thoth gave the Book of Thoth to the people. With its help, the future can be predicted. The Greeks incorporated a version of the book into their culture, the Christians rejected it as pagan. In the 17th century it supposedly influenced Freemasons, in the 18th century tarot card readers. Finally, in the 20th century, the flower power movement of the 1960s was based on its content. But since the actual book has not yet been found, it is doubtful that it ever really existed.

In the 1990s, German historian Michael Hesemann examined one of the most important Christian relics: the Titulus Crucis. The small piece of wood is said to have hung on the cross of Jesus and made known his name. But is it real or a medieval fake? Hesemann traveled across Europe and the Middle East to trace the history of this piece of wood, said to be 2000 years old. Eventually he confirmed the authenticity of the relic, but according to an examination using the scientifically approved C-14 method, it is a fake.

The dying days of World War II. Hitler was in his bunker, unable to accept defeat. But most Nazis knew the game was up. It was time to start hiding evidence of their crimes. A unit of SS officers were instructed to transport boxes to the Salzgammergut lake district in the Austrian Alps. Their destination was one of the most remote and deepest lakes in the region: Lake Toplitz. On 1st May 1945, eyewitnesses still alive today saw the SS Officers throwing the boxes into the lake. Local rumours grew: the boxes were full of stolen gold. It was the biggest bank heist in history.

This week’s episode turns to King Arthur who according to legend was Britain's greatest king. He led his Knights of the Round Table from Camelot, a vast, spectacular castle built on a hill, and was supposed to have bravely fought AngloSaxon invaders and united the country. But there's very little evidence he reallyexisted. In the 1960's a team of archaeologists, led by Leslie Alcock, set out to prove the myth was real. After five summers digging where tradition had the location Camelot to be, a hill just off the A303 in South Cadbury, Somerset they discovered Dark Age fortifications dated exactly to the time King Arthur was supposed to have lived, and a great hall, suitable for a King or leader of some kind. Proof, they believed, that Arthur, or someone very like him existed.

At the end of the 19th century, the Priest of Rennes-le-Chateau, Berenger Sauniere mysteriously and suddenly became fabulously rich. Rumours spread the priest had discovered buried treasure, but others claim Sauniere had uncovered a secret so profound, it could rock the foundations of the Catholic Church; evidence of a bloodline of Christ, the Holy Grail. Sauniere’s housekeeper, confidante and later lover, Marie Denarnaud was the only person who knew the truth, which she was going to reveal on her deathbed. However, she had a stroke and could not speak, leading many to this day to question what the truth is. Had the cup of Christ really been discovered?

The Honjo Masamune is perhaps Japan's most legendary sword, but no one knows where it is. Forged in the 13th century, it became the ceremonial sword of the Tokugawa samurai dynasty for 250 years. Since 1868 it was passed on from one generation to the next, but after the Second World War it disappeared. It may have been melted down undetected in occupied Japan, but experts believe it may have made its way to the United States as a souvenir. Today it would be worth millions and collectors hope that the lost sword of the samurai will one day be found.

In the early 1800s a party of men headed by a Thomas Beale set out from Virginia to the Colorado Rocky Mountains where they discovered gold. After mining a fortune in gold ore they exchanged it for treasure, which they then buried in Virginia's Blue Ridge Mountains. Beale recorded the secret location of the treasure in three numerical codes that when decoded would reveal the treasures value, its location and to who it belonged. Then in 1897 Clayton Hart discovered the three coded papers and soon after found out that they could reveal a great treasure in a pamphlet that revealed a deciphered paper revealing its value. With the help of his brother George, Clayton spent the next 50 years trying to uncover the location of Beale's treasure. They went to great lengths to break the ciphers, including assistance from America's top code breakers and even the supernatural!

For many it is the eighth wonder of the world: the Amber Room. Frederick I gave it to the Russian tsar in 1716, in 1941 the Germans stole it and brought it to Konigsberg, today's Kaliningrad. At the end of the war, the Amber Room disappeared without a trace - the starting signal for the greatest treasure hunt of the 20th century. For many years, the Soviet secret police and the Stasi directed the search. Finally, in 2002, a German company financed a replica that can be seen today in St. Petersburg's Summer Palace. But the search for the original continues.

For centuries, the Holy Grail has been regarded as a holy relic that brings life-force and its location have repeatedly given rise to a wide range of myths. In 1935 the writer Otto Rahn was ordered to Berlin and met Heinrich Himmler there. The Reichsfuhrer-SS commissioned Rahn to search for the Holy Grail. It was to be exhibited in Wewelsburg, used by the SS, which Himmler wanted to make his Camelot. Rahn traversed all of Europe in search of the Grail, but in the end he had to pay for his search with his life.

Legend has it that somewhere in South America there is a city of gold: Eldorado, the remnant of a kingdom that once lay deep in the Amazon jungle. British explorer Percy Fawcett believed in the legend. From 1906 he was regularly on expeditions in the border area between Bolivia and Brazil. In 1925 he started the Eldorado search with his son Jack and his best friend Raleigh. The disappearance of Percy Fawcett is still one of the greatest mysteries in history. The numerous search and research expeditions that were sent to unravel this mystery were all unsuccessful. There was indeed a mythical civilization in the jungle, but the riches of the true Eldorado had nothing to do with gold.