diff --git a/burguillos_info.json.example b/burguillos_info.json.example
index bf65a22..c914b43 100644
--- a/burguillos_info.json.example
+++ b/burguillos_info.json.example
@@ -3,5 +3,6 @@
 	"bcrypt_pass_stats": ["change_for_bcrypted_password"],
 	"db": {
 		"database": "example"
-	}
+	},
+    "base_url": "https://burguillos.info"
 }
diff --git a/content/posts/0000012-bar-el-bocaton.xml b/content/posts/0000012-bar-el-bocaton.xml
index 12c4538..9bb6e1b 100644
--- a/content/posts/0000012-bar-el-bocaton.xml
+++ b/content/posts/0000012-bar-el-bocaton.xml
@@ -1,6 +1,7 @@
 <post>
 	<author>Burguillos.info</author>
 	<date>2022-11-18T00:00+00:00</date>
+	<last_modification_date>2023-05-02T00:00+00:00</last_modification_date>
 	<title>El Bocatón - Café - Bar - Pastelería - Pizzeria - Hamburguesería.</title>
 	<ogdesc>El Bocatón - Café - Bar - Pastelería - Pizzeria - Hamburguesería.</ogdesc>
 	<category>comercios</category>
@@ -130,9 +131,5 @@
 
 		<p>Aprovechamos este espacio final tras terminar de listar el menú para adjuntaros más imágenes del local y desearos una feliz comida.</p>
 
-		<img alt="Exterior del Bar Bocatón." src="/img/bocaton-1.jpg"/>
-		<img alt="Exterior del Bar Bocatón." src="/img/bocaton-2.jpg"/>
-		<img alt="Exterior del Bar Bocatón." src="/img/bocaton-3.jpg"/>
-
 	</content>
 </post>
diff --git a/lib/BurguillosInfo.pm b/lib/BurguillosInfo.pm
index 3da92a0..708cd87 100644
--- a/lib/BurguillosInfo.pm
+++ b/lib/BurguillosInfo.pm
@@ -28,6 +28,7 @@ sub startup ($self) {
 
     # Normal route to controller
     $r->get('/')->to('Page#index');
+    $r->get('/sitemap.xml')->to('Sitemap#sitemap');
 
     #  $r->get('/:post')->to('Page#post');
     $r->get('/stats')->to('Metrics#stats');
diff --git a/lib/BurguillosInfo/Controller/Sitemap.pm b/lib/BurguillosInfo/Controller/Sitemap.pm
new file mode 100644
index 0000000..ad4ccf7
--- /dev/null
+++ b/lib/BurguillosInfo/Controller/Sitemap.pm
@@ -0,0 +1,111 @@
+package BurguillosInfo::Controller::Sitemap;
+
+use v5.34.1;
+
+use strict;
+use warnings;
+
+use BurguillosInfo::Categories;
+use BurguillosInfo::Posts;
+
+use DateTime::Format::ISO8601;
+
+use Mojo::Base 'Mojolicious::Controller', '-signatures';
+
+sub sitemap ($self) {
+    my $categories = BurguillosInfo::Categories->new->Retrieve;
+    my $dom = Mojo::DOM->new_tag(
+        'urlset',
+        xmlns => 'http://www.sitemaps.org/schemas/sitemap/0.9',
+        undef
+    );
+    $dom->xml(1);
+    for my $category_key ( keys %$categories ) {
+        $self->_append_category_dom( $dom, $category_key, $categories );
+    }
+    $self->render(text => $dom, format => 'xml');
+}
+
+sub _append_category_dom ( $self, $dom, $category_key, $categories ) {
+    my $category = $categories->{$category_key};
+    my $slug     = $category->{'slug'};
+    my $date_publish_category;
+    my $date_last_modification_category;
+
+    my ( $posts_categories, $posts_slug ) =
+      BurguillosInfo::Posts->new->Retrieve;
+    for my $post ( $posts_categories->{$category_key}->@* ) {
+        ( $date_publish_category, $date_last_modification_category ) =
+          _get_dates_for_category( $date_publish_category,
+            $date_last_modification_category, $post );
+        my $url_post = $self->_generate_url_for_post($post);
+        $dom->child_nodes->first->append_content($url_post);
+    }
+    my $url          = Mojo::DOM->new_tag('url');
+    my $base_url   = $self->config('base_url');
+    my $location_tag = Mojo::DOM->new_tag( loc => "$base_url/$slug" );
+    my $final_date_last_modification_category =
+      _compare_dates_return_most_recent( $date_publish_category,
+        $date_last_modification_category );
+    my $last_modification_tag =
+      Mojo::DOM->new_tag( lastmod => $final_date_last_modification_category );
+    my $priority_tag = Mojo::DOM->new_tag( priority => 0.6 );
+    $url->child_nodes->first->append_content($location_tag);
+    $url->child_nodes->first->append_content($last_modification_tag);
+    $url->child_nodes->first->append_content($priority_tag);
+
+    $dom->child_nodes->first->append_content($url);
+}
+
+sub _generate_url_for_post ( $self, $post ) {
+    my $url_tag                     = Mojo::DOM->new_tag('url');
+    my $date                        = $post->{date};
+    my $date_last_modification_post = $post->{last_modification_date};
+    my $final_date_last_modification_post =
+      _compare_dates_return_most_recent( $date, $date_last_modification_post );
+    my $base_url   = $self->config('base_url');
+    my $url_resource = "$base_url/@{[$post->{slug}]}";
+    my $last_modification_tag =
+      Mojo::DOM->new_tag( lastmod => $final_date_last_modification_post );
+    my $location_tag = Mojo::DOM->new_tag( loc => $url_resource );
+    $url_tag->child_nodes->first->append_content($location_tag);
+    $url_tag->child_nodes->first->append_content($last_modification_tag);
+    return $url_tag;
+}
+
+my $error_no_dates = "Undefined dates";
+
+sub _get_dates_for_category ( $current_date_publish,
+    $current_date_modification, $post )
+{
+    my @return_list;
+    @return_list = (
+        _compare_dates_return_most_recent(
+            $current_date_publish, $post->{date}
+        ),
+        _compare_dates_return_most_recent(
+            $current_date_publish, $post->{last_modification_date}
+        ),
+    );
+    return @return_list;
+
+}
+
+sub _compare_dates_return_most_recent ( $date_a, $date_b ) {
+    if ( !defined $date_a && !defined $date_b ) {
+        return undef;
+    }
+    if ( !defined $date_a ) {
+        return $date_b;
+    }
+    if ( !defined $date_b ) {
+        return $date_a;
+    }
+    my $date_a_dt = DateTime::Format::ISO8601->parse_datetime($date_a);
+    my $date_b_dt = DateTime::Format::ISO8601->parse_datetime($date_b);
+    if ( $date_a_dt >= $date_b_dt ) {
+        return $date_a;
+    }
+    return $date_b;
+}
+1;
diff --git a/lib/BurguillosInfo/Posts.pm b/lib/BurguillosInfo/Posts.pm
index f2e71d9..431a1c6 100644
--- a/lib/BurguillosInfo/Posts.pm
+++ b/lib/BurguillosInfo/Posts.pm
@@ -85,14 +85,22 @@ sub Retrieve {
             $image = $image_element->attr->{src};
         }
 
+        my $last_modification_date_element =
+          $dom->at(':root > last_modification_date');
+        my $last_modification_date;
+        if ( defined $last_modification_date_element ) {
+            $last_modification_date = $last_modification_date_element->content;
+        }
+
         my $post = {
-            title    => $title,
-            author   => $author,
-            date     => $date,
-            ogdesc   => $ogdesc,
-            category => $category,
-            slug     => $slug,
-            content  => $content,
+            title                  => $title,
+            author                 => $author,
+            date                   => $date,
+            ogdesc                 => $ogdesc,
+            category               => $category,
+            slug                   => $slug,
+            content                => $content,
+            ( (defined $last_modification_date) ? (last_modification_date => $last_modification_date) : () ),
             ( ( defined $image ) ? ( image => $image ) : () ),
         };
         $cached_posts_by_category->{$category} //= [];
@@ -136,7 +144,7 @@ sub PostPreviewOg {
       $self->_GenerateSVGPostPreview( $title, \@new_content, $post->{image} );
     my ( $stdout, $stderr ) = capture {
         open my $fh, '|-', qw{convert /dev/stdin png:fd:1};
-	binmode $fh, 'utf8';
+        binmode $fh, 'utf8';
         print $fh $svg;
         close $fh;
     };