april
attractions
blue sky
bridge
building
buildings
chikuma river
chosei bridge
chubu regional
civil engineering
civil engineering buildings
civil engineering heritage
historic buildings
infrastructure
japan
japan society of civil engineers
journey
koshinetsu region
landmark
morning
nagaoka
nagaoka city
national highway
niigata
niigata prefecture
niigata views
river
road
road bridge
route 351
scenery
shinano river
shinetsu region
social infrastructure
spring
sunny
tourism
tourist attractions
traffic
travel
truss bridge
warrentras bridge