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12 underground tours around the world
In Paris, you can tour the sewer system, in Berlin, check out a hidden world of bunkers and tunnels used during World War II and the Cold War, and see the remains of the older city (which the new city was built upon) in Seattle. Other cities with tours that take you underground include Vienna, Rome, Seoul, Portland, Naples, New York, Jerusalem, Edinburgh, and Istanbul.
And to Budget Travel's list of spots with unique attractions below ground, I'll add two of my own. Most visitors to Chicago don't realize that the city has it's own network of underground tunnels, called the Pedway, that connect many of the city's government buildings and allow people to travel between them without suffering in the bitter winter cold. And in Logrono, in Spain's Rioja region, the area underneath the town is actually larger in area than that above, thanks to an extensive network of tunnels that were once used for defense and are now used as wine cellars.
When we visit a new city we generally spend a lot of our time looking up, gawking at the tall buildings. But, it seems, maybe should pay a little more attention to the wonders just underneath our feet.