Landmark is used here in a narrower sense than visitor attraction: only those 21 monuments are listed here that are mentioned in the article List of landmarks under Hungary. The reason for the distinction is that e.g. all museums can be visitor attractions but not all of them are landmarks of a country.

The two sources used there are as follows:

• "Eyewitness Travel Guides - Budapest - 2007 - ISBN 978-0-7566-4862-6". DK Publications. Retrieved 2009-02-17.
• "Budapest, including the Banks of the Danube, the Buda Castle Quarter and Andrássy Avenue". Unesco World Heritage Centre. Retrieved 2009-02-10.