What is Adobe Stock's policy regarding travel photos that show known manmade landmarks, i.e. Eiffel Tower, Buckingham Palace, the Eye of London, the BMW museum in Munich, etc.
Are you asking as an Adobe Stock contributor or as someone who is licensing assets from the Adobe Stock site?
As a contributor.
In other words can I use any of my travel photos as stock or will they all be rejected because I don't have a property release?
It depends whether your travel photos have recognisable people in them or recognisable property, well-known landmarks, whether they contain logos etc...
For the Eiffel Tower, it depends on the time of day. They will reject night shots. Who'd guess? But the laws are very complex, and vary a lot by country. Start here: https://helpx.adobe.com/stock/contributor/help/known-image-restrictions.html