The following SharePoint pages control most of the Site Collection Settings. Some of the pages may or may not exist depending on the site collection type Foundation, Enterprise (on premise) or Office 365 P or E (cloud based).

Base URL = http://www.yoursite.com/PossibleSubSite/

Page and Location	Section	Purpose or Description
_layouts/enhancedSearch.aspx	Site Collection Administration	Search Settings
_layouts/viewscopes.aspx		View Scopes
_layouts/listkeywords.aspx		Search Keywords
_layouts/AdminRecycleBin.aspx		Recycle Bin
_layouts/ManageFeatures.aspx?Scope=Site		Site Collection Features
_layouts/vsubwebs.aspx		Site hierarchy
_layouts/SiteNavigationSettings.aspx		Site Collection Navigation
_layouts/AuditSettings.aspx		Site Collection Audit Settings
_layouts/Reporting.aspx?Category=Auditing		Audit log reports
_layouts/portal.aspx		Portal Site Connection
_layouts/Policylist.aspx		Site Collection Policies
_layouts/storman.aspx		Storage Metrics
_Layouts/sitecachesettings.aspx		Site Collection Output Cache
_Layouts/contenttypesyndicationhubs.aspx		Content Type Publishing
_Layouts/TranslatableSettings.aspx		Translatable Columns
PublishedLinks/AllItems.aspx		Suggested Content Browser Locations
_Layouts/DocIdSettings.aspx		Document ID Settings
_layouts/suppux.aspx		Visual Upgrade
_layouts/HelpSettings.aspx		Help Settings
_layouts/SharePointDesignerSettings.aspx		SharePoint Designer Settings
_layouts/sitehealthcheck.aspx		Site Collection Health Checks
_layouts/siteupgrade.aspx		Site Collection Upgrade