THE EMERALD TRIANGLE – Three years after Prop-64, the California law legalizing the adult use of marijuana, was passed, the state’s cannabis producers are not seeing the windfalls predicted. They tell Sharyn Alfonsi regulations and a robust black market are cutting into legal pot profits. Guy Campanile is the producer.

THE COLUMBUS LETTERS – A letter written by Christopher Columbus describing his discovery of the Americas became the world’s first best-seller when it was printed and distributed throughout Europe more than 500 years ago. Now the surviving copies are so rare and valuable that they’re being stolen and replaced with forgeries. Jon Wertheim reports. Katherine Davis is the producer.

BUILT BY ANGELS – Ethiopian pilgrims have been trekking to this mysterious holy site for centuries to visit its rock-hewn churches carved out of the African plateau. Scott Pelley made the trip in time for the Ethiopian Orthodox Christmas vigil and tells this remarkable story. Nicole Young is the producer.

These previously broadcast segments have been updated for summer viewing.

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