diff --git a/items/blog/dora-and-research-assessment/index.md b/items/blog/dora-and-research-assessment/index.md
index 2031f68a..0ef5c8b7 100644
--- a/items/blog/dora-and-research-assessment/index.md
+++ b/items/blog/dora-and-research-assessment/index.md
@@ -32,7 +32,7 @@ example of the need _not_ to do assessments this way.
 
 Last December, a forward-thinking group of editors and publishers met to
 discuss some of the problems with research assessment and came up with a
-[declaration](http://am.ascb.org/dora/) that recommended eighteen ways to
+[declaration](http://www.ascb.org/dora/) that recommended eighteen ways to
 improve the status quo. These are very doable things that we can do _now_ to
 improve the situation, not some ivory-tower Mumbo Jumbo.
 
diff --git a/items/blog/perspectives-on-business-models/index.md b/items/blog/perspectives-on-business-models/index.md
index 6ff4f33d..647e9469 100644
--- a/items/blog/perspectives-on-business-models/index.md
+++ b/items/blog/perspectives-on-business-models/index.md
@@ -69,7 +69,8 @@ then sell the company to a bigger company that can afford the windfall.
 
 [^contract-law]: Even though a large percentage of images from commercial image
     providers are in the public domain, from governmental providers, such as
-    [NARA](http://nara.gov), and are not copyrightable, these providers get
-    around this limitation through contract law by requiring new users to agree
-    to [certain conditions](http://www.ancestry.com/cs/legal/termsandconditions)
-    when they sign up for an account.
+    [NARA](https://www.archives.gov), and are not copyrightable, these
+    providers get around this limitation through contract law by requiring new
+    users to agree to [certain
+    conditions](http://www.ancestry.com/cs/legal/termsandconditions) when they
+    sign up for an account.
diff --git a/items/blog/unexpected-surprises/index.md b/items/blog/unexpected-surprises/index.md
index 2174da76..4011a55f 100644
--- a/items/blog/unexpected-surprises/index.md
+++ b/items/blog/unexpected-surprises/index.md
@@ -32,7 +32,7 @@ decided, "Eh, it can't hurt to at least read the thing." So I clicked it open.
 
 <!--MORE-->
 
-What I found was a message from an organization named [Giving Anonymously](http://givinganon.org/).
+What I found was a message from an organization named [Giving Anonymously].
 It said that some friend wanted to give us an anonymous gift and all we needed
 to do was reply and confirm that we would accept the gift. Again, I thought to
 myself, "Yeah, right!" and almost deleted it. Fortunately, I resisted the
@@ -97,3 +97,5 @@ mental support that encourages us to keep pushing forward.
 So, if you are out there, whoever you are, please accept my gratitude and
 thanks.
 {: .conclusion }
+
+[Giving Anonymously]: <http://web.archive.org/web/20130617171311/https://givinganon.org/home> "Giving Anonymously on the Wayback Machine"
diff --git a/items/colophon.erb b/items/colophon.erb
index cd871339..bcc06e80 100644
--- a/items/colophon.erb
+++ b/items/colophon.erb
@@ -218,8 +218,9 @@ changefreq: monthly
       <p>
 
         These vocabularies are used to describe things that are more technical
-        in nature, such as software projects and the machine-oriented vocabularies or
-        ontologies that we are creating in our <a href="/spec/">specifications playground</a>.
+        in nature, such as software projects and the machine-oriented
+        vocabularies or ontologies that we are creating in our <a
+          href="/specifications/">specifications playground</a>.
 
       </p>
 
diff --git a/nanoc.yaml b/nanoc.yaml
index ebbdf143..578dcc23 100644
--- a/nanoc.yaml
+++ b/nanoc.yaml
@@ -35,9 +35,12 @@ data_sources:
     content_dir: specifications/playground
     layouts_dir: specifications/layouts
 
-checks:
+checks: &checks
   internal_links:
-    exclude: ['^/blog/feed']
+    exclude: [ '^/blog/feed' ]
+
+  external_links:
+    exclude: [ 'example.org' ]
 
 environments:
   default: &default
@@ -105,6 +108,11 @@ environments:
       debug: true
       trackers: [ 'graphics.locating' ]
 
+    checks:
+      <<: *checks
+      internal_links:
+        exclude: [ '^/blog/feed', '^/tags', '^/archives', '^/authors' ]
+
   production:
     <<: *default