Go back to webpages you already visited in Safari on Mac
Safari remembers the webpages you’ve visited for as long as a year, so you can easily return to them.
See pages you visited in the current window or tab: Click the Back button
or Forward button 
in the toolbar (or use the Touch Bar). You can also click and hold the Back button or Forward button to choose a specific page. If you have a trackpad or mouse that supports gestures, swipe left or right to move through your history one page at a time. See Use trackpad and mouse gestures.See recently closed pages: Choose History > Recently Closed. You can also choose History > Reopen Last Closed Tab or History > Reopen Last Closed Window to reopen the last tab or window you closed, or Reopen All Windows from Last Session.
See a longer list of recently visited pages: Choose a webpage in the History menu.
See all webpages in your browsing history: Choose History > Show All History.
Browse thumbnails of webpages you visit frequently: Choose Bookmarks > Show Top Sites. If you don’t see Show Top Sites, choose Safari > Preferences, click General, then click the “New windows open with” pop-up menu and choose Top Sites.
Visit pages on your Reading List: Click the Sidebar button
in the toolbar, then click Reading List 
.
Safari uses iCloud to keep your browsing history the same on all your Mac computers and iOS devices that have Safari turned on in iCloud preferences. However, your Mac can keep your browsing history for as long as a year, while some iOS devices keep browsing history for a month. To change how often your Mac removes history items, use Safari General preferences on Mac.