I think that LWP::Simple isn't picking-up on XHTML. What's happening is that Wikipedia is using a wiki markup dialect called MediaWiki, and the best way that I have found to get that url is to use HTML::WikiConverter. Try this:

#!/usr/bin/perl

use strict;
use warnings;
use HTML::WikiConverter;

my $wc = new HTML::WikiConverter( dialect => 'MediaWiki' );
print $wc->html2wiki( uri => 'http://en.wikipedia.org/wiki/Hotel' ), "
+\n";
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Updated: fixed typo