London can seem like a deceptively easy trip abroad. After all, there's no language barrier or major culture shock. Our ongoing media exchange with Great Britain – all of those BBC shows and James Bond movies – means England's capital has a familiar, cozy feeling for most Americans. But don't be fooled. Newbies coming to London can make all kinds of blunders, which can cost you your time, money or sanity. Luckily, we've explored this city thoroughly, from the top of the London Eye to the bottom of the Underground, and come away with quite a few lessons in the process. Here are our top tips to avoid looking like a rookie on your next trip.