Images Rejected due to Intellectual Property while hundreds of others are accepted

In all of your assets, you have people in the view, so I suppose, you submitted a model release for each of them. If not, you can't submit the pictures.

Then on two of your pictures, you have beside people, also logos and other objects of interest in the focus:

In addition, but unrelated to the IP rejection, you also have quality issues.

Having other pictures in the database does not mean that yours will be accepted. There are many reasons, why other pictures got accepted. Probably the most usual is that all the authorizations were presented (model and property release) or the asset is used as an “editorial use only” asset.

Before you travel, contact landmarks well-ahead & ask them what their commercial photography policy is.  Personal photos for private use are usually permitted.  But commercial photography of grounds, buildings and collections are usually not allowed.  It would compete with their gift shop.  

See this link for more details.

https://helpx.adobe.com/stock/contributor/help/known-image-restrictions.html

In the first image you have clearly recognizable people - IP rejection.

In the second image you have a business name - IP rejection.

In the third image you also have people.

A quick scan on the Buyer Portal will reveal that the interior views at the Louvre are maked Editorial only. That means that a property release wasn't required; however, the Buyer can only use these image for editorial purposes, no commercial uses.