The Science Museum in London is a mecca for all things mechanical, with exhibits on flight, motive power, rocketry, and many more. A selection of a few of the more steamy exbihits are below.
The working replica of Babbage’s Difference Engine No. 2:

The prototype of the Clock of the Long Now:

The museum has a fabulous collection of aircraft engines through the ages. This one is from a 1908 Zeppelin:

A broad-gauge steam locomotive:




