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.
Colosseum (Rome, 1st century)
The most famous and most magnificent amphitheater of Rome was built in the 1st century.
Acropolis (Athens, 5th century B.C.)
The world's most famous citadel, the Acropolis of Athens was built in the 5th century B.C., during the Age of Pericles.
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.
Nizwa Fort (Oman, 17th century)
The round tower of the largest fort in the Arabian Peninsula had an ingenious defense system.
Effects of smoking on the lungs
Smoking severely damages the respiratory system, it may cause COPD or lung cancer.
Voyager space probes
The Voyager space probes were the first man-made objects to leave the Solar System. They gather data about outer space and carry information about humanity.
Leonardo da Vinci’s workshop (Florence, 16th century)
Visit the workshop of the Renaissance polymath and his most influential inventions and works of art.
The Alhambra in the 16th century (Spain)
The name of this magnificent palace complex originates in Arabic and means 'the red one'.
The anatomy of the heart
This scene presents the location, anatomy and functioning of the central organ of the human circulatory system.