I want to sell pictures of tourist attractions. Is there any copyright issue involved?

No.

When you take photos, the formation of these photos is the result of your labor, so the copyright of the photos belongs to you.

The only problem is to pay attention to whether the content itself contains the work of others, or is in a confidential location that is not suitable for publicity.

The rest is OK. Just pay attention to the wording when editing the photo, for example, if it sounds harsh or inconsistent with local customs, it's ok.