The next time you're in a new city, maybe jet-lagged, try to wake-up early and take a walk: The earlier the better. Watch as the city wakes, the merchants restock their shelves and workers take away the waste. Street sweepers and garbage collectors take advantage of the quiet streets; people open offices and stores; the calm before the rush. Perhaps your hotel is near a market – check out how early the bakers and farmers start working. A few newspapers are still delivered before the sun rises.
While walking and watching the city wake, also look beneath your feet. There the pipes deliver water and gas; sewers take away wastewater. And if you’re in Europe most of the electricity is delivered through underground piping as well (strange how cities in the US and Canada, where hurricanes are common, have most power lines above ground, while Europe, with fewer storms but more concern for aesthetics, have most power lines buried).