Like many other european cities also Prague has lot of hidden gems and secret places. Some of them almost 1000 years old. The city is famous for its beautifull architecture, but there are not only the treasures which are visible on first sight on the streets. Under the houses of patricians and palaces of nobilities a whole complex of underground cellars, rooms and labbyrinth-like corridors can be revealed. The whole city, mostly in the area of the oldTown is undermined with theese historical settings. Many times rebuilt, forgotten and again discovered give theese historical undergrounds an insight into the past, unknown facts and relations and give a picture of the life of a medieval city in the 11th and 12th century.