As museums usually contain valuable and famous pieces of art, they have their own policies when it comes to photos and copyright protection.

Some images taken at or in museums may not be sold as neither royalty-free nor editorial: 

City of Arts and Sciences (Ciudad De Las Artes Y Las Ciencias)
Interior and exterior images/footage are unacceptable for sale on Colourbox, both commercial and editorial.

Condes Castro Guimarães Museum
All photos from the Condes Castro Guimarães Museum in Portugal as well as all photos featuring paintings from the Condes Castro Guimarães Museum are not allowed for sale on Colourbox. This material is the property of the Cascais Town Hall. The material may not be uploaded as neither stock material nor as editorial material.

Guggenheim Museums
New York City, Bilbao, Venice, Berlin, and Las Vegas. – Interior and exterior images/footage are unacceptable for sale on Colourbox, both commercial and editorial.

Museum De Heksenwaag
Interior and exterior images/footage are unacceptable for sale on Colourbox, both commercial and editorial.

Sovereign Hill, Australia
Interior and exterior images/footage are unacceptable for sale on Colourbox, both commercial and editorial.

Monticello Estate in Virginia
Interior and exterior images/footage are unacceptable for sale on Colourbox, both commercial and editorial.