_155 Union Street Arches "<p>The building of Union Street was a considerable feat of engineering. Union Bridge over the Denburn valley is the largest and most visible of a series of arches that carried the street level above the then existing ground surface. Most of these arches were subsequently hidden by buildings lining the street. Doors Open Day provides the opportunity to enter one of these normally inaccessible spaces to view an exhibition about Union Street.<\/p>" Organization "<p>The building of Union Street was a considerable feat of engineering. Union Bridge over the Denburn valley is the largest and most visible of a series of arches that carried the street level above the then existing ground surface. Most of these arches were subsequently hidden by buildings lining the street. Doors Open Day provides the opportunity to enter one of these normally inaccessible spaces to view an exhibition about Union Street.<\/p>"