The Key Card Hotel (tons of pics here) was recently opened in New York City, a hotel entirely made of key cards, designed and built by world record holder of card house building, Bryan Berg, aka The Cardstacker.
The hotel is 37 m2 in size and has a bedroom, bathroom and lobby, entirely made of Holiday Inn key cards. Berg says that it is his biggest challenge ever on a human scale.
(Link: telegraaf.nl)