Concrete

Concrete has changed the world.
Invented more than 2000 years ago by the Romans it is the only reason that the beautiful Coliseum in Rome  is still standing today. I cant believe that they had any idea of what uses it could be put too in the future.
http://www.smithsonianmag.com/history/the-secrets-of-ancient-romes-buildings-234992/
Over the last 2000 years concrete has been adapted and adjusted to make it a very different product that was first invented. What most people dont understand is that reinforced concrete is very light for its strength.  This is hard to accept I know but its exactly why the Romans used it to make the massive dome of the Parthenon in Rome.

house for sale penela, Concrete
Concrete

Less amazing but more technical structures a situated around the world. Bridges like the beautiful Vasco da gamma bridge near Lisbon,
http://pt.wikipedia.org/wiki/Ponte_Vasco_da_Gama
airport runways, tall buildings, hospitals, harbors underground railways, tunnels, ships, nuclear bunkers and of course our own homes.

In Portugal a lot of reinforced concrete is used because it is light and strong, It is used to form the structural frame work around a house which makes it earthquake resistant and hurricane proof far more so than a house made of bricks for instance.

house for sale Penela
Concrete

Good well made concrete will last for thousands of years. Poorly made badly poured concrete may result in your home collapsing.