
Allright, listen up. While the Batman was away on a mission, the Riddler robbed the Gotham Bank and fled overseas. We need your help to find out where he is hiding. All we know is that he was last spotted in a city in the Netherlands. He is sure to have left us a trail of clues. You must find his last known location and follow the trail of clues to his hiding place! Use what gadgets you have, like google, wikipedia and google maps!
The tip that leads to the Riddler's arrest will be rewarded with a copy of Batman: Arkham City on Steam, to be gifted to your steam account.
He only left us one clue to his whereabouts.

Weight in my belly;
trees on my back;
nails in my ribs;
feet I do lack.
Despite such, in luxury I arrived,
This was surely the largest haven I had ever sought sanctuary, but it was a little too much to the left for my tastes.
Curiously enough, upon arriving I spied the largest swan I had ever seen. Yet, instead of splashing about, it silently carried people across the water.
Rules:
I have one copy of Batman: Arkham City to gift via steam. You guys will have to solve a series of riddles which will ultimately lead to a certain place. You should work together to solve all riddles but the last, as the first person to guess the Riddler's final hiding place will win the prize. I will post a new riddle when the previous one has been guessed. I will try to announce when I will post the final riddle so that everyone can have a fair chance at the prize.
This is a bit of an experiment, and more difficult to design than I had anticipated, so I hope this works well. I'm curious to see how this goes.
You can try to guess the answer to a riddle as many times as you like.