London
The United Kingdom’s capital city—covering 610 square miles (1,580 square kilometers)—is huge. Founded in A.D. 43, it’s also old. And powerful. London is a hub of culture, business, and politics—and center of the once glorious British Empire that can still throw its weight around the globe. Served by a fabulous subway system, numerous tour buses, and the iconic black taxis, London is not difficult to find your way around in. And despite the city’s enormity, the center is small enough to make walking a good option—just mind the warnings painted on the curb to look right when crossing the street. Drivers come at you, unexpectedly, along the left side of the road.