Sim, sim!
Código:
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<h2>Sobre Nós</h2>
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<div id="paineis-sobre" class="panel-group">
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<h3 class="panel-title" data-toggle="collapse" data-target="#primeiro-paragrafo" data-parent="#paineis-sobre">Parágrafo I</h3>
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<p>
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<div class="panel panel-default">
<div class="panel-heading">
<h3 class="panel-title" data-toggle="collapse" data-target="#segundo-paragrafo" data-parent="#paineis-sobre">Parágrafo II</h3>
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<div id="segundo-paragrafo" class="collapse">
<div class="panel-body">
<p>
Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nunc lacinia quam sed fermentum iaculis. Praesent convallis, neque sit amet laoreet venenatis, odio sem porta lacus, id faucibus urna enim at nulla. Nunc aliquet ex id lorem luctus, eget congue augue luctus.
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<div class="panel panel-default">
<div class="panel-heading">
<h3 class="panel-title" data-toggle="collapse" data-target="#terceiro-paragrafo" data-parent="#paineis-sobre">Parágrafo III</h3>
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<div id="terceiro-paragrafo" class="collapse">
<div class="panel-body">
<p>
Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nunc lacinia quam sed fermentum iaculis. Praesent convallis, neque sit amet laoreet venenatis, odio sem porta lacus, id faucibus urna enim at nulla. Nunc aliquet ex id lorem luctus, eget congue augue luctus.
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<h3>Mais de 300 prêmios em design e em conforto.</h3>
<p>Mais de 5 milhões de clientes satisfeitos em todo o mundo.</p>
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<section class="container">
<h2>Nossos Projetos</h2>
<figure class="thumbnail">
<img class="img-fluid" src="img/projetos/casa-castelo.png" alt="Foto da Casa Castelo">
<figcaption class="caption">
<h3>Casa Castelo</h3>
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</figcaption>
</figure>
<figure class="thumbnail">
<img class="img-fluid" src="img/projetos/casa-lago.png" alt="Foto da Casa Castelo">
<figcaption class="caption">
<h3>Casa Lago</h3>
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</figure>
<figure class="thumbnail">
<img class="img-fluid" src="img/projetos/mercado-marapira.png" alt="Foto da Casa Castelo">
<figcaption class="caption">
<h3>Mercado Marapira</h3>
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</figcaption>
</figure>
<figure class="thumbnail">
<img class="img-fluid" src="img/projetos/palacio-dionisio.png" alt="Foto da Casa Castelo">
<figcaption class="caption">
<h3>Palácio Dionisio</h3>
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. In tempor lacus et nunc luctus tincidunt. Nulla posuere purus a enim finibus ultricies. Mauris a tellus vel nisl convallis blandit.</p>
</figcaption>
</figure>
<figure class="thumbnail">
<img class="img-fluid" src="img/projetos/residencia-ludi.png" alt="Foto da Casa Castelo">
<figcaption class="caption">
<h3>Residencial Ludi</h3>
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