ABSTRACT
The focus of this paper is on picturing tunnel portals. Photographs of structures built in the past or visualisation of projects being prepared are provided with brief descriptions.
2 SMALL TUNNELS
2.1 Rudolph’s gallery
It is an underground gallery leading between the embankment of the river Vltava and Kralovska Obora (Royal Deer Park), which is the oldest tunnel in Prague. This historic monument was built in the years 15811593 to supply water to a pond in the deer park. The about 1000 m long gallery was excavated simultaneously from both ends and additional five shafts. The dimensions of the cross section are approximately 3.5 m × 2.2 m. The shafts and the gallery were supported only with round timber, which was replaced by masonry during the 18th century. This remarkable piece of technical work has been preserved up to the present time.
