@ehBeth,
Beth, the terrain i've researched, plus what mr h explained with pictures and links, is just phenominal. Canada rocks!
Thanks for all the info, hbg! Lovely photo of mrs hbg also.
Walt Whitman trivia: one of the first "urban explorers" {groups of people who explore abandoned buildings and sites}. The Poet, in 1861 was a reporter for a newspaper in Brooklin. He wrote about exploring the abandoned Atlantic Avenue subway tunnel, dug in the year 1844, the first of its kind - but seventeen years later, it was obsolete. In 1980 another explorer discovered the same tunnel, which had been blocked off for more than a century.
Coincidently, i'm reading a novel that mentions Walt Whitman's explorations.
Then i googled 'urban explorers' where there are numerous links to check out, and information explaining what urban exploreres do, types of gear, places they've seen, etc. Interesting.