There is a temple in India that is covered in gold and just a few years ago, the government gave permission to open the 6 chambers below the temple to discover what is inside. They did just that and found about a trillion dollars worth of gold, coins, jewels and incredible golden statues.
They found all the treasure that was in five of the vaults, but vault B was never opened. They can't. A Hindu monk must perform a sacred chant to open the door, but no one alive can do it. This one remains a secret.

2.EGYPT - Sphinx's Hall of Records
Under the left foot of the Sphinx is a chamber that is thought to be the Hall of Records. A place that houses the lost story of civilization. Some say it is tied to Atlantis. A true mystery, but we can't get to it.
The chamber is thought to have two entrances but both are blocked by modern construction by the Egyptian government. This is known, but hidden. Much like the Great Pyramid, there is a hidden chamber behind a door. Learn more in this video explanation by Graham Hancock.

China is home to what some say hundreds of pyramids. Most have been covered by nature and left unexplored. One, the supposed tomb to the first emperor, has been explored. Well... around the edges. That is where the Terra-Catta army was found.
Chinese archeologists know where the entrance is, but they refuse to go in. Some claim a curse, others claim that there are booby traps littered in the complex. I believe the second theory. It is also said that the emperor sealed all of the artisans that created the tomb inside... so maybe there is a curse. There is also an incredible treasure and what could be a piece of history from a time almost forgotten.
