The suspension bridge that stretches above the strait between San Francisco Bay and the Pacific Ocean was opened in 1937.
Uranus is the 7th planet from the Sun, a gas giant.
The invention of the ballpoint pen made writing a lot easier.
Venus is the 2nd planet from the Sun, the brightest object on the night sky (after the Moon).
The palace of Charlemagne was not only the centre of his empire, but also a centre of culture.
The concentration camp established on Polish territory was the administrative centre of a huge camp complex.
The main protagonists of World War II were tanks.
The first dwellings in human history provide a lot of information about the lifestyle of our ancestors.
Hero of Alexandria is the inventor of the first steam engine, although he regarded it as an entertaining toy.
The highway code contains rules concerning the safety equipment of bicycles.
Archimedes was one of the most brilliant Greek scholars of ancient times, who made his mark with military inventions as well.
The changing bicycle, at first mocked as a toy, is a true mirror of the technical development over the last three centuries.
Building 3D shapes into a given cube mesh with the help of several views.
The animation presents the main air, water and land routes and transport hubs.
As the Roman Empire expanded, military camps were established on the newly conquered territories.
Ancient Roman conquerors had effective siege engines developed for attacking fortifications.
The city with advanced culture was the first settlement in history to have a citadel.
Submarines had an important role in naval warfare as early as World War I.
The boundaries of tectonic plates can be seen on the seafloor.
The purpose of the electricity supply network is to provide electricity for consumers.