How Did They Build That? Season 4 Episode release dates & where to watch

1. Space Stations & Super Inventions

Lives are on the line creating the International Space Station, a scientific marvel a decade in the making, that changes the way we look at the world.

2. Medals & Marinas

A floating museum honors military heroes in Texas. A sky-park casino balances on six towers. And an office is carved out to protect NYC's High Line.

3. Speedcore & Steambend

A railway-spanning library mimics the clouds. A speed-core skyscraper is built in record time. And a world first bridge inspired by a child's toy.

4. High Waters & Harsh Winds

Apartments hanging 164 feet above the water defy gravity in Amsterdam. A trio of towers shimmer on Chicago's skyline, and museum design is revolutionized in Paris.

5. Ecobuilds & Earthquakes

An airport gets a 9 acre roof without stopping flights. A museum is buried in the desert to keep it cool. And building San Fran's most hated tower.

6. Shipyards & Slender Builds

A 284ft timber tower tests fire safety limits. An old crane tracks is reborn as sleek glass offices. And 28 apartments are stacked on a 21ft plot.

7. Summit & Submerge

A mountain-top centre defies extreme altitude. A stunning museum is sunk into an old dock. And a 600ft tower with floating gardens rises in Singapore.

8. Facelifts & Scaffolds

A museum bends 1,100 glass tubes into a bold facade. A vast atrium rises where the Berlin Wall fell, and a NJ bridge is raised 65ft for huge tankers.

9. Super Stadiums & Extraordinary Elevators

A 70,000 seat stadium defies seismic forces in LA. Malta's 33 story tower twists around old vaults. And an 807ft elevator test tower spirals skywards.

10. Floating Parks & Upcycled Towers Finale

San Francisco's MOMA dramatically triples in size. A skyscraper transforms by smart demolition. And 5 acres of parkland floats above Dallas traffic.