Internationale Gartenbauausstellung 73
international gartenbauausstellung iga garden festival held hamburg germany recognized bureau international de exposition exposition th edition international horticultural exposition organised auspex association international horticultural producer aiph second held planten un blomen park hamburg exhibition took place site iga held decade earlier change site location vaulting marseillerstrasse visitor throughout area without crossing could visit instead cable car park trail constructed site provide visitor line four station took minute complete lap official website bie