Contrary to the traditional English nursery rhyme, London Bridge isn’t falling down; it’s in Arizona. Lake Havasu City, to be precise. Quoting from the Wikipedia article:

London Bridge is a bridge in Lake Havasu City, Arizona. It was originally built in the 1830s and formerly spanned the River Thames in London, England. In 1968, the bridge was purchased from the City of London by Robert P. McCulloch. McCulloch had exterior granite blocks from the original bridge cut and transported to the United States for use in the construction of a new bridge in Lake Havasu City, a planned community he established in 1964 on the shore of Lake Havasu. The Arizona bridge is a reinforced concrete structure clad in the original masonry of the 1830s bridge. The bridge was completed in 1971 (along with a canal), and links an island in the Colorado River with the main part of Lake Havasu City. The “rededication” of the London Bridge took place on October 10, 1971.

There’s more info (including a video of inside the hollow bridge) on the visitor information site.

We visited London Bridge while staying nearby for the Xscapers Annual Bash:

Lots of locks:

Driving over the bridge wasn’t anything special; it’s just like any other bridge from the top, other than the UK flags:

We walked by and below it:

The historic London Bridge with palm trees made for an interesting juxtaposition.