Mysteries Unearthed With Danny Trejo

From priceless treasure found inside a lost city, to an ancient manuscript hidden behind a wall, explores mysterious secrets lost deep inside various unseen chambers like tunnels, caves and burial sites.

From clandestine nuclear weapons programmes to a secret Cold War bunker hidden in the mountains, or even World War 2 technology at the bottom of the sea, we explore the unlikely people, and surprising places.

From ancient religious texts buried in Egypt to cultural relics found at sea, or even a tower of skulls hiding under the earth, these lost artefacts change what is known about certain sacred beliefs.

From a deadly discovery hiding under one of America's most loved national parks, to a Nazi era weapon sunk off the coast of New Jersey, or even a bloodthirsty predator found in Canada--you never know where a killer find is hiding.