Amazeballs! Built around the year 100 (yes, just 100), this Roman aqueduct is a 2,000-year-old…read morearchitectural flex. No mortar. No glue. Just rocks stacked. How did these people know they weren't in an earthquake zone? This thing is still standing, still iconic, and apparently still hydrated the city up until 1974, which is, frankly, ridiculous. Romans: the original civil engineers who said what if we made plumbing beautiful?