My husband, Bob, is retired from a 44-year career as a civil engineer. Consequently, when we travel, engineering marvels are always at the top of our "must see" list.
There are many engineering feats I have not witnessed such as the pyramids of Egypt and the Great Wall of China.
But, I have seen the underside of the Golden Gate Bridge, and viewed the Royal Gorge Bridge of Colorado from a tram 1100 feet above the river.
I've been claustrophobic at the top of the St. Louis Arch, and have ridden 13 miles across the Confederation Bridge to Prince Edward Island in Canada.
I've been in the bowels and seen the inner workings of the Tower Bridge in London, and traveled 180 miles an hour under the water of the English Channel through a tunnel.
BUT, in my opinion, the absolute best, best, best engineering marvel is the Eiffel Tower in Paris.
It combines the structure and strength of engineering and the beauty and form of art.
I know that there are professional photos that capture that beauty better than our amateur pictures, but these are ours and remind me that I was actually there!