These special dolmens located in present-day Netherlands were built about 5,000 years ago.

Jamestown (17th century)

Jamestown, founded in 1607, was the first permanent English settlement on the east coast...

Topography of the Earth

The animation presents the largest mountains, plains, rivers, lakes and deserts of the Earth.

Cannon operation (18th century)

The cannon was an important type of firearms at the beginning of modern history,...

Aztec warriors (15th century)

The fearsome looking Aztec warriors could not stop the Spanish conquistadors with their...

Native American settlement (Crow Nation)

The Crow are Native Americans who inhabited the Yellowstone River valley.


Paper was invented more than two thousand years ago.

De Havilland DH-106 Comet 1 (1949)

The aircraft manufactured by the British de Haviland company was the world's first...

Knee joint

The knee joint is made up by the femur, the tibia and the kneecap.

Typical dwelling types

Every era and every culture has specific residential buildings.

Types of bridges

Types of bridges include beam-, arch-, suspension-, cantilever and truss bridges.

Medieval Chinese Emperor

The Emperor of the vast Far-Eastern empire was the lord of life and death.


Пристанищата осигуряват нужната инфраструктура и услуги за индустрията и морския транспорт.


Airports provide infrastructure and services necessary for aviation.

System of public utilities

System that satisfies consumers’ demands of water supply, wastewater disposal,...

Conformations of ethane

The staggered conformation of ethane is more stable than the eclipsed conformation.

The first days in school

Learn the concept of colours, numbers, letters and shapes while playing

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