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Tisá, the village by which the Tisá walls are located, lies in northern Bohemia, very close to German border. It can be easily reached from cities Usti nad Labem or Decin. Tisá walls are protected area, you can visit them after paying very small fee (adults cca 1 Euro, children and students 0,5 Euro). The path is marked very well and is not difficult to walk, it will take you about 2-3 hours (but you can spend there whole day).

Here is more information taken from http://www.tisa.cz/e_ts_uvod.htm
I wouldn't write it better.

"The Protected landscape area Labské pískovce (The Elbe Sandstone Rocks) is a part of an extensive sandstone plateau that originated about 90 million years ago in the Cretaceous Mesozoic period. When the sea covering the northern part of the country retreated it left here layers of sandstone sediments cemented with kaolin, clay and other material. In the course of time the movement of the crust of the earth resulted in cracking of these sediments. Further gradual weathering, erosion, and the drifting away of materials resulted in richly diversified area of deep canyons and vertical walls covered by pictoresque shapes.
The most western part of Labské pískovce (The Elbe Sandstone Rocks) are Tiské stěny (The Tisá Walls) called after the nearby village Tisá. A massive rock wall is towering above the north end of Tisá, rising up to 70 meters. The Tisá Walls measure 613 meters at their highest point. They continue eastward for almost a kilometer where they end at the Tourist Chalet. We can come here across all forms of sandstone rocks. There are massive rock faces as well as isolated towers and narrow needles. They offer many ascents, more or less difficult ones, to the beginning as well as experienced mountain climbers. Group of towershaped formations resemble fortifications and care called castles. Narrow defiles run between the rock faces and there are wild gorges and ravines. You come across "boulder seas" caused by folding rock, with some boulders of magnificient size."