Archaeologists hunt for Queen Cleopatra's lost tomb; underwater archaeologists explore sunken ruins; a team takes mummies to the hospital to scan for hidden treasure; an archaeologist discovers a secret tunnel network at a forgotten temple.

A dramatic find reveals ancient, state-sanctioned tomb robbery on an industrial scale.

An investigation into why the great pharaohs of Egypt abandoned the pyramids of Giza and chose a secret cemetery in the Valley of the Kings in which to be buried; a team looks for clues to identify human remains found in looted graves.

Archaeologists unearth a long-lost box of treasures from inside Tutankhamun's tomb; new technology reveals why this boy king's resting place remained hidden from tomb robbers for thousands of years; a team is tasked with transporting Tut's treasures.

Archaeologists find evidence about how ancient Egyptians prepared for the afterlife; a pharaoh's tomb reveals the sacred text needed to secure life after death; mummified remains reveal the lengths to which grave robbers went in search of treasure.

In Egypt, archeologists uncover the stories of Cleopatra and Hatshepsut.

Archeologists in Egypt's Valley of the Nobles unwrap the secret lives of people from the ancient past.

Archaeologists investigate Hatshepsut, one of the greatest female pharaohs in history; a discovery inside one of Hatshepsut's quarries sparks an investigation which leads to the temple of Karnak; an archaeologist excavates mummy parts.

Archaeologists find new tombs in the Valley of the Kings.

Alastair Sooke explores the great treasures of ancient Egypt.

Unlocking ancient Egypt's greatest mysteries.

America is full of archaeological secrets buried in the earth. In this series, forensic geologist Scott Wolter -- considered a real-life Indiana Jones by some -- travels across the country to uncover some of the hidden treasures and to reveal the history associated with them, discovering in the process that there is a lot Americans don't know about the country's past, and the history that people do know may not always tell the whole story. Ancient symbols, religious relics and other artifacts that Wolter unearths indicate that various civilizations have left their mark on the nation.

Some of the world's famous relics have secrets behind them that contribute to their complete stories. "Secrets" explores the mysteries relating to some of these historic landmarks to reveal the truths behind them. The latest research and forensic techniques are used to find out the stories behind the fabled cities, monuments and remnants featured on the show. Episodes include Egyptian historians on a mission to decode the mysteries of the Great Sphinx, archeologists unearthing secrets of Richard III, and an investigation into whether the bust of Nefertiti is real or a hoax.