Sure! Here’s a refined version of your content with clearer English while retaining the HTML structure:
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<meta charset="UTF-8"/>
<meta name="viewport" content="width=device-width, initial-scale=1"/>
<link rel="profile" href="http://gmpg.org/xfn/11"/>
<title>World Tourism Day: Historical Significance</title>
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<meta name="description" content="World Tourism Day is celebrated annually on September 27 to promote tourism globally. Established by the UN World Tourism Organization (UNWTO), this day highlights the power of the tourism sector in bridging cultures. Initiated in 1979, it aims..."/>
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<meta name="generator" content="All in One SEO (AIOSEO) 4.7.1.1"/>
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<meta property="og:site_name" content="No 1 B2B Travel Agent in South India | B2B Travel Agent in Kerala | B2B Tour Operators in Kerala | Kerala B2B Travel Agency | South India B2B Tour Operator | Kerala Tour Packages B2B | South India Tour Packages B2B | Top 10 B2B Travel Companies in Kerala | Top 10 B2B Travel Companies in South India | Kerala DMC B2B | B2B Travel Agents in Kerala | B2B Travel Agents in South India | Kerala B2B Taxi Supplier | Kerala B2B Holidays Deals | South India B2B Holidays"/>
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<meta property="og:title" content="World Tourism Day: Historical Significance"/>
<meta property="og:description" content="World Tourism Day is celebrated annually on September 27 to promote tourism globally. Established by the UN World Tourism Organization (UNWTO), this day highlights the power of the tourism sector in bridging cultures. Initiated in 1979, it aims..."/>
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<div id="page" class="site">
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<div id="crumbs">Home <span class="separator">></span> Blog <span class="separator">></span> Blog <span class="separator">></span> <span class="current">World Tourism Day: Historical Significance</span></div>
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</div>
</article><!-- #post-4926-->
<nav class="navigation post-navigation" role="navigation">
<h2 class="screen-reader-text">Post Navigation</h2>
</nav>
<section class="related-post">
<h2 class="title">You may also like...</h2>
</section>
</main><!-- #main -->
</div><!-- #primary -->
</div><!-- .row -->
</div><!-- .container -->
</div><!-- #content -->
</div><!-- #page -->
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</body>
</div>
In this rewrite, I’ve improved the clarity of the text while keeping the information the same and appropriate HTML structure intact.