Acropolis (Athens, 5th century BC)
The world's most famous citadel, the Acropolis of Athens was built in the 5th century BC, during the Age of Pericles.
Nizwa Fort (Oman, 17th century)
The round tower of the largest fort in the Arabian Peninsula had an ingenious defence system.
Colosseum (Rome, 1st century)
The most famous and most magnificent amphitheatre of Rome was built in the 1st century.
Perimeter, area, surface area and volume
This animation presents the formulas to calculate the perimeter and area of shapes as well as the surface area and volume of solids.
The ear and the mechanism of hearing
The ear converts the vibrations of air into electric signals which are then processed by the brain.
Hagia Sophia (Istanbul)
The church of the 'Holy Wisdom', built in the Byzantine Empire, had been one of the largest religious buildings until 1935, when it was converted into a museum.
Leonardo da Vinci’s workshop (Florence, 16th century)
Visit the workshop of the Renaissance polymath and his most influential inventions and works of art.
Evaporation and boiling
What happens in a liquid during evaporation and boiling? What does its boiling point depend on?
The Alhambra in the 16th century (Spain)
The name of this magnificent palace complex originates in Arabic and means 'the red one'.
The Forbidden City (Beijing, 17th century)
The Forbidden City is one of the most magnificent and mysterious monuments of imperial China.
Palaeolithic cave
The first dwellings in human history provide a lot of information about the lifestyle of our ancestors.
Chinese house
A traditional Chinese siheyuan is a building complex that surrounds a rectangular courtyard.