TV Guide National Geographic Channel Thursday

Homeland Security Investigations arrest a counterfeit passport ring; Customs and Border Protection seizes methamphetamine at a railyard.

A girl's online romance sets off serious red flags at the airport.

A disturbing discovery at the mail center has Biosecurity on high alert.

The Coastguard seizes a boat carrying over three tons of drugs.

New drug trafficking strategies include stashes that are anchored to the seabed and narco-submarines.

Spanish Coastguards fight human trafficking with unexpected results.

Sea, air and land units from the Spanish Coastguards strive to uncover drug trafficking plans.

New discoveries uncover how the Romans ruled the seas for four centuries.

Archaeologists are excavating the vast frontier of the Roman Empire.

Archaeologists conduct a dig at Pompeii, the archaeological site near the coast of the Bay of Naples, in order to uncover its dark secrets.

New discoveries reveal the secrets of the Roman gladiators' enduring appeal.

Archaeologists reveal the stunning new discovery of a Nero megastructure.

Family treasures from ancient Egypt which belonged to Tutankhamun are shown, and various artifacts undergo a meticulous level of forensic investigation.

A death mask made out of pure gold is thought to belong to Tutankhamun, but a number of scholars question the reality behind this common belief.

Lost artifacts that had been removed from the tomb of Tutankhamun are shown, and modern researchers make an effort to reunite the collection.

An examination of the ancient Mayan civilization reveals a lost fortress, a sacred altar and war in the remotest corner of the Mayan world.

An investigation of Mayan history reveals a mysterious pyramid, gruesome discoveries in an uncharted cave system, and insight into their spirit world.

A search for royal tombs among the ruins of the Mayan civilization leads to the discovery of a royal drinking cup, which in turn points to a lost Mayan king.

An exploration is made into a lost Mayan city, with special emphasis placed on the lost pyramids and unearthed treasures found there.

Host Dan Snow searches for Pompeii's gripping story of rediscovery.

Dan Snow explores the dinosaur gold rush in America's Wild West.

New information that was discovered about Herod the Great's tomb has cast doubt upon the generally agreed on location, and experts explore new opinions.

Host Dan Snow searches for Pompeii's gripping story of rediscovery.

Dan Snow explores the dinosaur gold rush in America's Wild West.

Actress Cara Delevingne travels to Sardinia, an Italian island in the Mediterranean Sea, where she fulfills her dream of going on an adventure with Bear Grylls.

Host Bear Grylls leads actor and former professional wrestler Dave Bautista on a desert expedition through parts of Glen Canyon in Arizona.

Rock climber Alex Honnold travels to the Swiss Alps to join Bear Grylls on an adventure in which they travel through rugged valleys and climb up steep cliffs.

Actor Zachary Quinto meets with Bear Grylls to take part in a jungle adventure in Panama, and during their adventure, the men discover a gathering storm.