If We Built It Today - Episode Guide

Egypt's Great Pyramid is one of the world's greatest and most mysterious marvels, and using cutting-edge tech and the latest engineering innovations, experts reveal what it would take to build the ancient wonder today.

New York's Brooklyn Bridge might be the most important bridge in the world, and it took dangerous, cutting-edge engineering to build it. Experts use the latest tech and modern-day science to reveal if building it a second time would be just as deadly.

Rome's Colosseum is the most famous stadium on the planet, and it took cutting-edge engineering and a fallen emperor to build it. Experts use the latest tech and modern-day science to reveal if building it a second time would be just as difficult.

According to the Bible, Noah's Ark was a world-changing engineering feat, and it took cutting-edge construction to build it. Experts use the latest tech and modern-day science to reveal if building it a second time would be just as difficult.

Rome's aqueducts are one of the greatest engineering marvels in history, and it took dangerous, cutting-edge construction to build them. Experts use the latest tech and modern-day science to reveal if building them a second time would be as deadly.

The Great Wall of China is one of the world's greatest engineering marvels, and it took dangerous, cutting-edge construction to build it. Experts use the latest tech and modern-day science to reveal if building it a second time would be as deadly.

Rome's Pantheon hides the secret to the Roman Empire's power, and it took dangerous, cutting-edge engineering to build it. Experts use the latest tech and modern-day science to reveal if building it a second time would be just as deadly.

Venice, Italy is a city in crisis, and it took dangerous, cutting-edge engineering to build it. As apocalyptic floodwaters unleash havoc, experts use the latest tech and modern-day science to reveal if building it a second time would be just as deadly.

When catastrophic fires ravaged Notre-Dame Cathedral in Paris, France during April 2019, one of the world's great wonders was left in ruins. Experts use the latest tech and modern-day science to reveal what it will take to build it a second time.

Washington, DC was built as the capital city of a new, revolutionary country, and it's home to some of America's greatest wonders; now, experts use cutting-edge engineering to reimagine what this place would look like if we had to build it again.

For more than 2,000 years, explorers have searched for any trace of the legendary Utopian civilization that sank beneath the ocean. Now, experts imagine what would happen using modern engineering to build an underwater megacity for a modern-day Atlantis. 

The Parthenon is the crowning jewel of ancient Greek architecture engineered according to a mysterious mathematical formula, the golden ratio; expert builders examine the secrets of its design and investigate if modern-day methods could rebuild it. 

The Titanic pushed the boundaries of engineering and luxury like never before, but it's also the most well-known disaster; experts use cutting-edge tech to discover if a modern vessel of equal opulence could be successfully built for the sea today. 

America's transcontinental railroad helped transform the United States into a global superpower, and today, cutting-edge engineering is behind hi-tech railways to once again revolutionize travel from sea to shining sea. 

Machu Picchu is one of the greatest landmarks of world architecture, yet the purpose of its construction and how it was built still remains a mystery; experts use cutting-edge engineering to reveal what it would take to rebuild this legendary city.

The Eiffel Tower stands as the ultimate symbol of Paris and an innovative form of engineering that had never been achieved; now, architects reveal how this groundbreaking design holds the key to constructing the world's tallest skyscrapers of the future. 

From ancient cave dwellings to massive multi-winged estates, the home has never stopped evolving; now, experts mix modern materials with state-of-the-art technology to reveal if a modern home can be constructed to truly stand the test of time. 

The Empire State Building was the tallest building in the world for 40 years and was constructed faster than any skyscraper in history; now, experts use cutting-edge engineering to discover if a new mega-tall tower could be built today at record speed.

The Hoover Dam was an epic engineering experiment that created an oasis of American opportunity during the darkest decade of the 20th century; modern engineers believe reconstructing it may hold the secret solution to renewable energy innovation.

The Statue of Liberty is an artistic wonder of construction and the most famous symbol of freedom in the world; now, experts use cutting-edge engineering to reimage what America's greatest icon would look like rebuilt to record-breaking new heights.

For centuries, concert halls have been precisely designed and engineered to shape the best possible sound for acoustic performance; now, experts use state-of-the-art science to discover how the next generation of concert halls could be constructed.

Stonehenge is an astonishing achievement of ancient construction that continues to baffle engineers thousands of years later; now, experts use the latest science to discover the logistics behind erecting another legendary monument today.

The Roman Empire built some of the greatest structures in history, and now, experts use cutting-edge technology to see if these cutting-edge engineering marvels could be made today. This is a mashup of S01E07, "Fortress of the Gods" and S01E03, "Ghosts of the Colosseum."