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Looking for name and author of a science fiction book about alternate worlds or timelines

I read this book a couple of years ago and can't remember the name or the author (also not sure if it was just one book or series - if it was more than one book then it would be 2 or at most 3 books) - anyway the plot is about a group of people finding an alien ship or machine that contains these doorways into alternate or paralell worlds.  If I recall correctly I think there were a couple of these ships/machines found and one was in South America although that was later in the story.The aliens are nowhere to be found so the people start exploring the ships and find the doorways. After going thru one of the doors they find that they can't get back to their original  timeline or world and they keep trying to find out how to get back.  Also they find artifacts and machines left by the misssing aliens who created these ships/machines and try to find out about them. One part that I remember - After the world at large has found out about the ships/machines - one way they use the doorways are as prisons by  sending criminals thru the doors and sending supplies thru and just let these criminals sort things out amongst themselves.  I know this is really vague. I usually download most of the books I read and then delete them from my e-reader. Any help is appreciated.
asked Dec 28, 2016 in Name That Book by jbr549 (52 points)
edited Dec 28, 2016 by jbr549
Maybe :Doorways in the Sand" by Roger Zelazny.

'...Humanity is not alone in the cosmos. The aliens have given a precious relic to the people of Earth: star-stone. The harmony of the galaxy is at stake when they discover the disappearance of their star-stone.
Likeable Fred Cassidy is an eternal undergraduate. All he thinks he knows about the star-stone is that it came to Earth in an interplanetary trade for the Mona Lisa and the British Crown jewels.
Then Fred is accused of stealing the cosmic artifact, and he is pursued from Australia to Greenwich Village and beyond, by telepathic psychologists, extraterrestrial hoodlums and galactic police in disguise; as he enters multiple realities, flipping in and out of alien perspectives, through doorways in the sand...'
commented Dec 29, 2016 by Sandy (7,725 points)
Thanks but that's not it. I haven't read Doorways in the Sand  but have read other books and stories by Zelazny. He's one of my favorite authors. I'll have to get a copy of Doorways - sounds interesting.
commented Dec 31, 2016 by jbr549 (52 points)
Was answered here: http://scifi.stackexchange.com/questions/148584/looking-for-name-and-author-of-a-science-fiction-book-about-alternate-worlds-or

Stranger Suns by George Zebrowski
commented Jan 1, 2017 by CarlosCM (211 points)
Yes that's the book I was trying to remember. Thanks CarlosCM for the link.
commented Jan 1, 2017 by jbr549 (52 points)

1 Answer

"Stranger Suns" by George Zebrowski

Found out by user CarlosCM in the comments.
answered Aug 30, 2019 by casspir (19,166 points)
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