Marco Polo trailing is free through VISMT( so are materials)
and I have had good success with teachers and students.
Other distance learning initiatives that I would recommend are;
Journey North and the GLOBE project.
There are numerous others I have used over the years.
Email me at [log in to unmask] and I will be happy
to give you more information.
Deborah Foster, Librarian
Fletcher Elementary School
and
Leicester Elementary School