<main>
    <section id="parks">
        <h2>Top 3 Must-Visit Parks</h2>
        <article>
            <h3>1. Yosemite National Park</h3>
            <img src="yosemite-valley.jpg" 
                 alt="Yosemite Valley with El Capitan rock formation and waterfall" 
                 width="600" height="400">
            <p>Famous for its waterfalls, deep valleys, and ancient sequoias.</p>
            <ul>
                <li>Location: California</li>
                <li>Established: 1890</li>
                <li>Best feature: Half Dome</li>
            </ul>
        </article>

        <article>
            <h3>2. Grand Canyon National Park</h3>
            <img src="grand-canyon.jpg" 
                 alt="Panoramic view of Grand Canyon's layered red rock formations" 
                 width="600" height="400">
            <p>Home to one of the world's most spectacular geological wonders.</p>
            <ul>
                <li>Location: Arizona</li>
                <li>Established: 1919</li>
                <li>Best feature: South Rim views</li>
            </ul>
        </article>

        <article>
            <h3>3. Acadia National Park</h3>
            <img src="acadia-park.jpg" 
                 alt="Ocean meeting rocky coastline at Acadia National Park at sunrise" 
                 width="600" height="400">
            <p>Where mountains meet the Atlantic Ocean along Maine's coast.</p>
            <ul>
                <li>Location: Maine</li>
                <li>Established: 1919</li>
                <li>Best feature: Cadillac Mountain sunrise</li>
            </ul>
        </article>
    </section>

    <section id="tips">
        <h2>Essential Travel Tips</h2>
        <ol>
            <li>Check park websites for alerts and closures</li>
            <li>Arrive early to avoid crowds</li>
            <li>Pack layers - mountain weather changes quickly</li>
        </ol>
    </section>

    <section id="resources">
        <h2>Learn More</h2>
        <p>Explore official park information at <a href="https://www.nps.gov" target="_blank" rel="noopener">National Park Service</a>.</p>
    </section>
</main>

<footer>
    <p>&copy; 2023 National Parks Explorer. All photos courtesy of <a href="https://www.nps.gov" target="_blank" rel="noopener">NPS</a>.</p>
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