In the film, which is a part of the NOVA series Secrets of Lost Empires, a team of timber framers and other specialists design, build, and fire a pair of trebuchets, a devastating engine of war popular in the Middle Ages.

In the film, which is a part of the NOVA series Secrets of Lost Empires, NOVA brings together a team of Egyptologists, engineers, stonemasons, and timber framers to probe the mystery of how the ancients shaped, transported, and erected their elegant obelisks.

The film, which is a part of the NOVA series Secrets of Lost Empires, showcases the efforts of a team of archeologists, engineers, and other experts to transport an Easter Island moai, or carved stone monolith, overland and successfully raise it onto a pedestal.

In the film, which is a part of the NOVA series Secrets of Lost Empires, an international crew of archeologists, engineers, and historians designs, builds, and tests a functioning Roman bath in the Turkish countryside.

The film, which is a part of the NOVA series Secrets of Lost Empires, documents a 1999 effort by a NOVA-assembled crew of scholars and timber framers to design and build a Chinese bridge known only from an ancient painting.

The program probes the deep mysteries of gamma-ray bursts, the most powerful celestial explosions since the big bang.

In the program, NOVA accompanies the men and women of a wildland firefighting crew known as the Arrowhead Hotshots as they battle one of the most destructive wildfire seasons ever, the summer of 2000.

Could a mummy found in Niagara Falls be the remains of a long-lost Pharaoh?