It is actually possible to travel extensively without money, or at least, with very little.
Every year there are a few people that start out on long trips with no money at all, whilst others do so with seemingly unlimited budgets. Most people fall somewhere between these two extremes.
How ever much you have, it has been said that is it better to travel with very little money than to not travel at all.
Plenty of travel websites and blogs exist on the Internet, many of them document the experiences of budget travellers. For example, this one, which makes [...]
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Once, whilst returning from a trip to Italy, I met a man on a train who was travelling dressed only in a swim suit and a towel. He had left his bag on the beach for just a few moments to paddle in the sea. When he returned it was gone, along with his passport, money, tickets and all of his clothes (apart from his towel).
Some countries insist that you show some means of support (credit cards or cash), or have evidence of an address where you will be staying (hotel, friends, etc.) while visiting. You may also need to show return or onward air tickets.