It is believed that Sangam 1964 was the first film shot in Foreign but on researching, I have found that Naaz(1954) was the first Bollywood film shot in Foreign Locations. The film starring Ashok Kumar and Nalini Jaywant. This movie was shot in England and Egypt.
In 1960, two films Bewqoof starring Kishore Kumar and Singapore starring Shammi Kapoor had songs picturized in Italy and Singapore.
There was another film "Hongkong" released in 1962 was shot in HongKong and Singapore. A couple of songs were picturized on Helen and Om Prakash. Yes, it is true it was Raj Kapoor's Sangam that popularized Rome, Venice, Vatican, Switzerland.
In the 60s films like An Evening In Patis, Love In Tokyo, and Humsaya encouraged more producers and directors to shoot songs on foreign locations. Yash Chopra had a fascination for picturizing songs on foreign locations starting from the evergreen 'Dekha Ek Khwab....' song from his 1981 film 'Silsila' in the Netherlands, and his film 'Faasle' (1985), in Switzerland.
The video of Naaz 1954 film is not available so the first song of my this blog is from the film Bewqoof 1960 which was picturized on Kishore Kumar and Mala Sinha. The sing was picturized in Italy. This song was sung by Kishore Kumar and Asha Bhonsle, with one line in Manna Dey’s voice, slipped in.
Hongkong 1962. This film was produced by the actor Omprakash
The song is picturized on Helen where she is seen wooing Omprakash.on a beach in Singapore.