There are 24 World Heritage Sites in the United States and Puerto Rico. The USA has more Natural than Cultural sites, which is unusual among UNESCO countries.
In Cologne, a little race of creatures called Heinzelmännchen, came out at night after the humans went to bed to do all of the work of the citizens of Cologne.
The highest concentration of castles is in Germany’s 40-mile-long Upper Middle Rhine Valley, a UNESCO World Heritage Site. This compact region contains 40 castles.
Because allied forces chose to avoid hitting the Cathedral, Cologne Cathedral survived World War II bombings when everything else in the city was completely destroyed.