Call your local travel agent and ask about the sculptured stone walls of the world. Inquire about the countries they are located in, and whether they hidden in jungles and hard to get to. Ask about traveling to see them though specialty travel or adventure tours.
Contact the art and archaeology department of a large university near you and ask about the locations of sculptured stone walls. Specifically contact the sculpture department and ask the head of the department about them. Also contact the art history department and discuss stone sculpted walls with the professors. Some of these academicians may have studied sculptured stone walls during their own education or may have made them the subject of their course curriculum.
Locate a sculpture club and ask its members about the topic. Inquire if they have a newsletter or are affiliated with a national magazine in which you can place ads related to your search.
Do a detailed Internet search. Spend extra time using alternative keyword searches, based on country, type of stone wall, sculptures, etc. Find leads and call people up on the phone and discuss what you are looking for.
Research amazon.com and other Internet sites for specialty books by professionals who have traveled and documented their research related to sculptured stone walls.
Contact PBS (http://www.pbs.org/) through its website to research any documentaries. Research other art and sculpture documentaries.
