Crossing downtown Seoul is the Cheonggye stream -- a river that was covered by a road until it was unearthed in 2005 and transformed into one of the city center's most popular urban oases and worth a stroll in the evening.

CNN: Look into your Seoul for a hit of Korean flavor

Then from nowhere emerged a large group of Iraqis -- an old man, several young boys and a stream of women enveloped in black chadors -- that began crossing a major intersection overlooked by Humvees.

CNN: 's Karl Penhaul

Crossing a medial moraine, we reach a pothole in the ice with a stream plunging into it.

BBC: The perfect trip: Switzerland