"DSC_5059" by K.M. Klemencic is licensed under CC BY 2.0.

"WER_3865" by Cathy T is licensed under CC BY 2.0.

"Sky Reflector" by OiMax is licensed under CC BY 2.0.

"Boston Panorama" by Harald is licensed under CC BY 2.0.

"20120909 028 Boston" by David Wilson is licensed under CC BY 2.0.