This Must Be The Place is the name of the 5.5 meters tall and 43 meters wide 17.5-ton artwork placed on the cliff opposite Bergen Flesland Airport Terminal 3. The six letters and quotation mark (2.5 tons each) were designed by Icelandic artist Ragnar Kjartansson (born 1976) and unveiled in in 2017. The costs of the whole thing was 9 million NOK.
The artwork is meant to initiate a thought process around the place travellers have arrived at (or are leaving). But basically it is a boolean question, to which the National Public Road Administration has an answer, and the answer appears to be "no", since they have put up signs leading towards "Bergen" just nearby, even though the airport is within the official city limits.
To find the cache, you must get as close to the artwork as you possibly can without doing anything out of the ordinary.