There are many merchants - both online and offline - accept Bitcoin as a form of payment. Includes huge online retailers like Overstock and Newegg to shops, bars and small local restaurants. Bitcoin can be used to pay for hotel costs, flights, jewelry, applications, computer parts and even a college degree.
Other digital currencies like Litecoin, Ripple, Ethereum and others have not yet been widely accepted. Things are changing for the better, Apple has authorized at least 10 different types of Cryptocurrency as a viable form of payment on the App Store.