And can travel anywhere in time and space.
"It is a time machine." The Doctor spoke the last words in a dramatic whisper, evidently expecting Anna to be impressed. She was.
"So, I'm standing in a blue telephone box, that's massive inside, and it just happens to be a time machine?"
"Exactly. Not only can it travel in time, it's also a spaceship. You could go anywhere you wanted." As he spoke, the Doctor started fiddling around with some of the knobs and levers, twisting and pulling. The machine in the middle made machine-like noises, but seemed almost responding to his touch.
"I could go to Mexico? I've always wanted to go to Mexico."
"Mexico, sure. The boring old country, Mexico. Or, you could go to a small planet across the galaxy that does great enchiladas. Much better than the ones on Earth, believe me. Or you could go to the planet with the glowing blue fruit. You liked that story, didn't you? Anywhere that takes your fancy, you can go.
"So," the Doctor said, running in front of the middle console and addressing Anna directly, building up to his big finish "anywhere, anywhen, any place in the whole of time and space. Everything that ever was, and ever will be. Where do you want to go?"
Anna considered this for a minute, then grinned. "I want to…I want to go to the first time we met. That was the best point of my life, the time when I realised that I was special. I want to relive that moment, just once. Then I want to see the people with worms on their faces. And the glowing blue fruit. And the bed-rocks. But first – our first meeting."