diff --git a/src/components/Toolbar/TagListPanel.js b/src/components/Toolbar/TagListPanel.js
index 6097e72..6db1469 100644
--- a/src/components/Toolbar/TagListPanel.js
+++ b/src/components/Toolbar/TagListPanel.js
@@ -2,6 +2,14 @@ import React from 'react'
 import Checkbox from '../presentational/Checkbox'
 import copy from '../../common/data/copy.json'
 
+/** recursively get an array of node keys */
+function allAssociatedKeys (node) {
+  if (!node.children) return [node.key]
+  const childKeys = Object.values(node.children).flatMap(n => allAssociatedKeys(n))
+  childKeys.push(node.key)
+  return childKeys
+}
+
 function TagListPanel ({
   tags,
   activeTags,
@@ -9,26 +17,31 @@ function TagListPanel ({
   language
 }) {
   function createNodeComponent (node, depth) {
+    const matchingKeys = allAssociatedKeys(node)
+    const children = Object.values(node.children)
     return (
       <li
         key={node.key.replace(/ /g, '_')}
-        className={'tag-filter active'}
+        className={'tag-filter'}
         style={{ marginLeft: `${depth * 20}px` }}
       >
         <Checkbox
           label={node.key}
           isActive={activeTags.includes(node.key)}
-          onClickCheckbox={() => onTagFilter(node.key)}
+          onClickCheckbox={() => onTagFilter(matchingKeys)}
         />
+        {children.length > 0
+          ? children.map(tag => createNodeComponent(tag, depth + 1))
+          : null}
       </li>
     )
   }
 
-  function renderTree () {
+  function renderTree (children) {
     /* NOTE: only render first layer of tags */
     return (
       <div>
-        {Object.values(tags.children).map(tag => createNodeComponent(tag, 1))}
+        {Object.values(children).map(tag => createNodeComponent(tag, 1))}
       </div>
     )
   }
@@ -37,7 +50,7 @@ function TagListPanel ({
     <div className='react-innertabpanel'>
       <h2>{copy[language].toolbar.tags}</h2>
       <p>{copy[language].toolbar.explore_by_tag__description}</p>
-      {renderTree()}
+      {renderTree(tags.children)}
     </div>
   )
 }
diff --git a/src/components/presentational/Timeline/DatetimeBar.js b/src/components/presentational/Timeline/DatetimeBar.js
index 3cb668b..45e4c5b 100644
--- a/src/components/presentational/Timeline/DatetimeBar.js
+++ b/src/components/presentational/Timeline/DatetimeBar.js
@@ -33,7 +33,7 @@ export default ({
           className='event'
           x={x}
           y={y - sectionHeight + (idx * sectionHeight)}
-          style={{ ...styleProps, opacity: h ? 0.3 : 0.05 }}
+          style={{ ...styleProps, opacity: h ? 0.5 : 0.1 }}
           width={width}
           height={sectionHeight}
         />
diff --git a/src/reducers/app.js b/src/reducers/app.js
index ee416f4..57e916d 100644
--- a/src/reducers/app.js
+++ b/src/reducers/app.js
@@ -118,12 +118,19 @@ function decrementNarrativeCurrent (appState, action) {
 }
 
 function toggleFilter (appState, action) {
-  let newTags = appState.filters[action.filter].slice(0)
-  if (newTags.includes(action.value)) {
-    newTags = newTags.filter(s => s !== action.value)
-  } else {
-    newTags.push(action.value)
+  if (!(action.value instanceof Array)) {
+    action.value = [action.value]
   }
+
+  let newTags = appState.filters[action.filter].slice(0)
+  action.value.forEach(vl => {
+    if (newTags.includes(vl)) {
+      newTags = newTags.filter(s => s !== vl)
+    } else {
+      newTags.push(vl)
+    }
+  })
+
   return {
     ...appState,
     filters: {