Japan

Tokyo

If you want to see the Eiffel tower, why not go to Tokyo? They have one as well, not so busy too.
Take a walk at Shinjuku and Harajuku at night.
Learn some Japanese or prepare your trip well, English is not as widely spoken as you might expect.
Travel from Tokyo to Kyoto by bullet train. It's quite expensive but a very impressive trip.
Travel in the subway in rush hour, not to get somewhere fast but just for the fun of it.