The special Altars from the Theaters of War are available while the event is live in the game. Once it is turned off, these altars will not be visible anymore.
No need to worry as your saved Tokens will still be available to use once the next Theaters of War event goes live in the game! Stay tuned for more updates via the live streams in our Social Media channels:
Official Dawn of Titans Facebook Page: http://zynga.my/DOTofficalfacebookpage
Official Dawn of Titans YouTube Page: http://zynga.my/DOTofficialyoutube
See you on the battlefield!