history 53 tunneling works 39 architectural designs 36 underground (transport) 32 road tunnels 31 ancient monuments 30 drfting 27 more ... reconstruction 26 underground structures 22 tunnels 22 building designing 21 transport constructions 19 urban underground transport 17 dwelling houses 14 rebuildings 14 office buildings 13 concreting works 13 bridges 13 concrete constructions 12 waterproof insulations 12 architectural composition 11 roofs 11 ventilation and air-conditioning 11 iron-concrete constructions 11 galleries (mining) 10 architecture 9 front walls 9 stone construction 9 roof covering 9 repairs 9 less ...