For most of us, our desire to travel exceeds our budget. Can virtual reality replace the real thing? It would be pretty nice to paddle through a mangrove swamp or stroll along the Great Wall of China without having to negotiate time off work. Unfortunately, this is unlikely to happen any time soon. The smell of a tequila distillery or the fireworks at a local festival won't be coming to any headset. More importantly, real travel involves the excitement of uncertainty and the risk of the unknown -- and no electronic experience can replace that.