Partners can display location-targeted offers within the GetYourGuide to specific destinations using the 3 letter IATA parameter (data-gyg-iata="BER") & the respective airport IATA Codes, as seen here:
<div data-gyg-href="https://widget.getyourguide.com/default/activites.frame" data-gyg-iata="BER" data-gyg-locale-code="en-US" data-gyg-widget="activities" data-gyg-number-of-items="3" data-gyg-partner-id="XXXXXXX"></div>
To build your own widgets, you can find more information here.
Finding IATA codes
IATA codes can be found on IATA.org, using the location lookup search.