The area covers around 4 316 km2 and is cut in half by an imaginary line connecting Prague and Pilsen. The area called Barrandien became famous thank to the french scientist Joachim Barrande (1799-1883). He carried out large paleontological research in central Bohemia and Barrandien is named in his honour.
The oldest rocks date back to the Late Proterozoic eon. The layers include all four geologic eons - the Cambian, Ordovician, Silurian and Early and Middle Devonian. http://www.barrandien.cz/

There are plenty of memorable trees in Beroun region. The list of them can be found in the respective Nature Reserve website.

CZECH KARST NATURE RESERVE

KŘIVOKLÁTSKO NATURE RESERVE

You can follow an educational trail The Memorable Trees of Karlštejnsko, which is described HERE.

There are plenty of memorable trees in Beroun region. The list of them can be found in the respective Nature Reserve website.

CZECH KARST NATURE RESERVE

KŘIVOKLÁTSKO NATURE RESERVE

You can follow an educational trail The Memorable Trees of Karlštejnsko, which is described HERE.

The castle was built in 2001-2002 in a historicizing style, using traditional craft processes.
A museum with large collections of the Czech countryside, showing every-day life in 17th to 20th centuries, can be seen in the castle interiors. 
There is a tavern and a garden with an open air museum with a wind mill, a hop dryer, a bell tower, etc..

by car 21 km https://www.hrad-cervenyujezd.cz/ Coordinates: 50.0719944, 14.1653908

The Renaissance seat of the Knights of the Cross with the Red Star, burnt down in 1639 by the Swedes, rebuilt in the Baroque style in 18th century.
The chateau was declared to be a national cultural monument, and at the present time, it is under the administration of National Heritage Institute.
The chateau is closed to the public, with the exception of the Zámecký had restaurant.
The municipality of Dobřichovice ocassionally holds cultural events in the chateau.

by car 22 km https://www.dobrichovice.cz/ Coordinates: 49.9259061, 14.2744386