More than 1000 tremors rock Los Angeles every year. Many are small but some are devastating. Scientists from NASA's Jet Propulsion laboratory have innovative technology to discover which buildings are most at risk.

In Los Angeles, there?s always the risk of the next big quake. Engineers must quake-proof buildings to keep city residents safe; these innovative techniques allow the entire structure to move when the ground beneath shakes.

The roads to Machu Picchu aren't built for wheeled vehicles. Instead, they're carefully constructed so that humans and animals can traverse steep cliffs on staircases built into the mountainside.

Still standing firm more than 500 years after being built, Machu Picchu continues to provide engineering lessons to those studying the ancient site. How did the Inca build such a site?

The Eiffel Tower was the tallest structure in the world for more than 40 years. Today, it's the most iconic landmark in Paris. See what lies hidden from the naked eye.

Paris has the second busiest Metro hub in Europe but cracks in the rocks could be a serious safety problem. Travel beneath Paris to explore a hidden world underneath the surface.

New Orleans lies up to 10 feet below sea level and is surrounded by water. When a hurricane hits, the city is threatened from all sides

Hurricane Katrina devastated much of New Orleans in 2005. Many people thought the city's Superdome was indestructible - but it wasn't. Now engineers take innovative steps to stop the next big storm from wreaking havoc.

After the devastating 2011 earthquake and tsunami, engineers in Japan search for safer ways to provide energy to the islands. One idea: The Squid.

The Tokyo Skytree is the tallest tower in the world. Take a look under the steel to see what keeps the tower standing tall and strong.

Venice stands on 10 million ancient tree trunks, rooted ten feet into a layer of firm clay.

Comparing an 18th century painting to Venice as it looks today, scientists can determine how far and how fast the water level is rising.

As the largest rail hub in America, Chicago has to think creatively to keep the system and running... especially during extreme weather.

New innovations keep the second busiest airport in America safe during summer heatwaves in Chicago.

Manhattan's distinctive skyline is shaped by schist bedrock, which provides a rock hard foundation for One World Trade Center, the tallest building in the Western hemisphere.

Dubai is designed to withstand incredibly strong sandstorms. See how engineers test infrastructure designs against winds up to 80 mph.

More than 1000 tremors rock Los Angeles every year. Many are small but some are devastating. Scientists from NASA's Jet Propulsion laboratory have innovative technology to discover which buildings are most at risk.

For centuries the Daiku's methods have been mysterious because they were only passed down from master to apprentice.

The millenium old art of sword making was passed down through generations.

Innovative ceramics, evolved from traditional Japanese clay working, have changed the course of technological advatages

A suprising modern day application to an ancient technique.

The central pillar concept, prevalent in traditional Japanese construction for centuries, has been directly adapted to sky scrapers.

The wonder of silk begins with mulberry leaves and sometimes ends with a beautiful kimono.

The Magic Mirror had a revival in the mid-16th century Japan, saving the lives of the persecuted.

Each sword maker has his own formula, creating a extremely hard blade with willow like flexibility.

Traditional Japanese construction, influenced by Shinto, had almost tree-like characteristics.

Compressed airlines with special constricting sleeves are used to articulate the robot's face.

The Tea Ceremony became so popular it sparked an industry.

Passed down through generations, Japanese magic mirror making remains a delicate and tedious process.

The pagoda's central pillar is the secret to its eathquake resistance.

The steel's natural variations are used to the metallurgist's advantage, they give a sword its beauty, personality, and its effectiveness.

The importance of the Roman bath culture is described.