Josh journeys into the heart of Mongolia in search of the fabled lost tomb of Genghis Khan. After encountering harsh weather and resistance from locals, can Josh enter Mongolia's "Forbidden Zone" to locate the burial grounds?

The episode was rated 7.71 from 153 votes.

Gates hunts for the Heart of Suleiman the Magnificent, ruler of the Ottoman Empire in the 16th century. When Suleiman died in 1566 during a battle in Hungary, his body was brought back to Istanbul, but not before a ritual was performed involving the removal of his heart being placed in a gold container and buried beneath his tent. The Sultan's followers believed his heart has magical powers and continues to beat, waiting to be returned to its host. The town of Tubek was built over the burial site to honor the Sultan.

The episode was rated 7.73 from 117 votes.

Josh explores the ocean floor of the Cayman Islands and the coasts of North Carolina in his quest to find the lost treasure of the legendary pirate Blackbeard.

The episode was rated 7.74 from 161 votes.

Gates searches for Yamashita's Gold, millions of dollars in Southeast Asian gold and jewels that was looted by Japan and covertly transported to the Philippines under the direction of Japanese general Tomoyuki Yamashita during World War II. The fortune was hidden by gangsters, military generals, and a secret organization in tunnels and caves somewhere in the conquered country. But the treasure was lost when the Allies won the war, until a treasure hunter found part of it in 1970 and has been searching for it ever since.

The episode was rated 7.75 from 112 votes.

Gates travels to South Africa to search for the missing Kruger Millions, the gold coins of the country's entire financial reserve. The treasure vanished overnight after South African President Paul Kruger loaded the hoard on a train and it vanished overnight in 1900 during the Boer War.

The episode was rated 7.75 from 118 votes.

Josh embarks on a journey around the world to uncover mysteries about Christopher Columbus. First, Josh looks for Columbus' legendary ship, the Santa Maria, and later ventures to find the real remains of the explorer.

The episode was rated 7.77 from 122 votes.

Gates searches for a lost city in the Kalahari Desert in Africa. First discovered by circus pioneer The Great Farini in 1885, he supposedly came across the ruins of a lost city half buried in the scorching sands. Those who followed in his footsteps came up empty-handed and claimed it a hoax, while even some vanished. Today, a modern explorer launched an all new expedition which Gates joins.

The episode was rated 7.79 from 136 votes.

After learning about the ancient Buddhist realm of Shambhala in Kathmandu and exploring the skycaves, Gates continues his search for the real Shangri-La. This time, he discovers a rock tower used for human burials and filled with bones dating back to 800 A.D. Next, he travels to Lo Manthang for another day of investigation in the Martzon area to climb a cave system called Pumamba, which is linked to the legend. Then he heads to Chuusang, a remote cave monastery that has never been excavated before.

The episode was rated 7.80 from 147 votes.

Josh searches for the lost mummy of Atahualpa, the last great king of the Incan empire, hidden high in the Andes Mountains and in the jungles and highlands of Ecuador. His reign ended when Spanish Conquistador Francisco Pizarro murdered him and brought the Inca civilization to an end. But the emperor obtained great power and wealth, even in death. His body was mummified in a sacred ritual to give him supernatural sway over the world of the living. Then, his body vanished. Archaeologists have been searching ever since.

The episode was rated 7.82 from 131 votes.

Gates digs up the truth behind vampire legends. His travels start at Curtea Veche in Romania, where he learns about Vlad the Impaler, the inspiration behind Dracula. Then off to Marotinu de Sus, a Romanian village, where six men desecrated a fresh grave believing it to be a "strigoi". He ends in Perperikon, Bulgaria to examine a supposed vampire grave.

The episode was rated 7.84 from 203 votes.

Gates searches high in the Himalayas for Shangri-La. He learns of its legend as a hidden utopia. In the most remote reaches of Nepal near the border of Tibet is an area known as the Mustang, an area that's been closed off to the outside world and the passage of time. But now Josh and his fellow archaeologists have been granted access to explore it. He finds out secrets hiding inside its sky caves, man-made chambers carved into cliff walls.

The episode was rated 7.86 from 140 votes.

Josh searches for the mysterious civilization of Teotihuacan, a lost empire left behind in Mexico with soaring pyramids dedicated to the gods, imposing temples, and a treasure trove of cryptic art. He seeks answers on who these indigenous people were, finds out their secrets that have been buried for 2,000 years, and what they left behind.

The episode was rated 7.88 from 136 votes.

The search for Nazi secrets and their stolen gold continues in the darkest corners of history; both underground and underwater. This time, Josh dives for relics of Nazi foreign minister Joachim Von Ribbontrop who dumped his family's entire fortune into the dark and deep waters of Lake Fuschlsee in the Austrian Alps. In order to learn if the Nazis where building an atomic bomb, he starts his quest for answers in Hitler's hometown of Linz. Then, he stops at the Mauthausen-Gusen concentration camp memorial in Sankt Georgen an der Gusen to pay his respects to the hundreds of thousands who perished here. He also explores 25 miles of tunnel under the Bergkristall complex, the largest secret underground facility ever built. It was designed by SS General Hans Kammler to oversee the Nazis nuclear project.

The episode was rated 7.89 from 149 votes.

Josh exposes Nazi secrets as he searches for the lost fortune of war criminal Adolf Hitler's billions in gold, art and relics stolen on his orders by the Nazis to suport his doomsday weapon during World War II. They also built networks of hidden tunnels and bunkers. Today, archaeologists use modern technology to recover treasure and excavate the underground legacy of the Third Reich. On his journey, Josh joins them, first finding answers in Germany, identifying gold in a Nazi train hidden inside a mountain in Poland. Then, in Austria, he explores a subterranean facility to a top secret lab to build a war machine.

The episode was rated 7.92 from 133 votes.

Gates searches for the treasure of art dealer Forrest Fenn, who after being diagnosed with terminal cancer hid his fortune, worth $2 million, deep in the Rocky Mountains north of his hometown of Santa Fe, New Mexico.

The episode was rated 8.07 from 135 votes.