Seabourn is extending a partnership with the United Nations Educational, Scientific and Cultural Organisation (UNESCO) to help protect world heritage sites.
The luxury line and its passengers have contributed more than $1 million to UNESCO since 2014.
The five-year extension will continue to foster wider support and understanding in the travel industry and among travellers for UNESCO’s mission of safeguarding and promoting the world’s cultural and natural heritage.
Fares for optional Seabourn excursions to UNESCO World Heritage Sites include a small donation to the organisation.
The line offers more than 250 trips to more than 170 UNESCO designated sites and has also created special world heritage discovery tours at several ports.
Seabourn president Richard Meadows said: “We’re incredibly proud to continue our relationship with UNESCO as their official cruise partner, building on the work we have completed together in recent years.
“Together we share a common view that the preservation of cultural and historic sites around the world has lasting impact on travellers for generations to come.”