I've been to Niagara Falls more times than I can count, and it is ALWAYS simply incredible. I've stood by the falls for hours, until soaked by the spray. I've also been there when the smaller section (The American falls) was frozen.
Águeda's Umbrella Sky Project began Portuguese city's annual Ágitagueda Art Festival. Each summer, when temperatures soar, a handful of Águeda's narrow streets feature canopies of colorful umbrellas that provide shade to the pedestrians below.