Not just Trump's idea: A short history on famous walls and the environment

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Donald Trump isn't the first leader to want to put up a border wall.http://feeds.feedburner.com/~ff/rss/cnn_us?d=yIl2AUoC8zA</img> (http://rss.cnn.com/~ff/rss/cnn_us?a=ZkV1ttnkuw4:NgUfqDcrcZY:yIl2AUoC8zA) http://feeds.feedburner.com/~ff/rss/cnn_us?d=7Q72WNTAKBA</img> (http://rss.cnn.com/~ff/rss/cnn_us?a=ZkV1ttnkuw4:NgUfqDcrcZY:7Q72WNTAKBA) http://feeds.feedburner.com/~ff/rss/cnn_us?i=ZkV1ttnkuw4:NgUfqDcrcZY:V_sGLiPBpWU</img> (http://rss.cnn.com/~ff/rss/cnn_us?a=ZkV1ttnkuw4:NgUfqDcrcZY:V_sGLiPBpWU) http://feeds.feedburner.com/~ff/rss/cnn_us?d=qj6IDK7rITs</img> (http://rss.cnn.com/~ff/rss/cnn_us?a=ZkV1ttnkuw4:NgUfqDcrcZY:qj6IDK7rITs) http://feeds.feedburner.com/~ff/rss/cnn_us?i=ZkV1ttnkuw4:NgUfqDcrcZY:gIN9vFwOqvQ</img> (http://rss.cnn.com/~ff/rss/cnn_us?a=ZkV1ttnkuw4:NgUfqDcrcZY:gIN9vFwOqvQ)
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