Hi Purrsia and Catspat! Now I understand, so it's almost like here. A few years ago we had to give our names and say something like: "I'm going to college, can't serve the army", then you have to send, each year, a letter proving that you are indeed in the college and that you haven't failed a year. Recently we don't even have to do that, meaning that only go there if you really want to join the army. Since I am Brazilian and have also Portuguese nationality, I have this ridiculous task of going to the Brazilian Consulate to "stamp" each year a paper to say "I don't want to go to the army THIS YEAR". I must do this until I'm 32! Only a very few young people want to go to the army here, some go because they can't find a better "job" and a military career can earn some good $, and have a lot of benefits. And since the country is not on war since the 60's or 70's there isn't much "danger". Only a few when to Afganistan but only in those "patrol missions". They didn't fire one round. Purrsia, I'm glad your husband didn't have to go there, it was a real luck! And also your grandfather, serving in WWII and returning alive... Catspat, it's always a pleasure having your colaboration! :D About the aqueduct, I asked my grandfather that knows a lot about this stuff and he told me this one has the biggest arch made of stone in the world! That one I didn't knew! He said "Something like 25 meters wide and 60 in height". that one is just a part of the whole water system, since there are a lot of underground canals and ramifications. If one would measure the whole size of it, the system is about 50,60 km. Lisbon has a river crossing it, the Tagus that is "born" in Spain, but the water there is salty, because of the proximity with the sea and there was very little good water for the people that lived there in those ancient times. The lack of water was so huge that people had to stay in line for only a cup of water. Sometimes there were fights and it was said that "People went for water, they return with blood". Then in 1750s they build that aqueduct that, as you said, the gravity leads the water to a reservoir where, back then, it was distributed to the city! I believe that there was a spring on the other extreme that filled the canal. Here we don't have drafts, at least to my knowledge, since the country hasn't been in war for decades and we haven't that "military pride" like I see in the USA. In fact, most of the war veterans here not seen as war heroes. I have some uncles that served in Africa back in the 60's-70's and I enjoy to hear their stories. Some are really dramatic but every time I'm with them I ask if they don't remember "other story". Yesterday I went to the post-offices and noticed some veterans asking for donations... I talked with one of them and told him: "Well, here's one idea: I've never seen a book that has the stories of Portuguese war-heroes, since your association has a lot of members, why not each of them writes one story? Then try to sell that book for some company." I would buy it!