... and posted some very nice images of the architecture-excursion to Los Angeles and San Fransisco, guided by Martin Krammer in May 2012:
Fotos Architecture Excursion Los Angeles San Francisco ZT-Forum
and you will find the images of the architecture field-trip to Rio de Janeiro, Brasilia and Sao Paulo from March 2013 as interesting:
Fotos Architecture Excursion to Rio de Janeiro, Brasilia, Sao Paulo