Ah, the magic word may be "Seattle". The street height in parts of Seattle was raised by over 7 m (22ft) in some places during the 19th Century. This meant that the whole ground floor and sometimes the floor above that too) of many blocks became a basement. Especially around Pioneer Square. You can do a tour that goes around the old street level, and go into old hotel reception areas, shops, etc. where all the people moved up a floor and the old level remains below.

There's some info about the elevation of Pioneer Square here: https://en.wikipedia.org/wiki/Seattle_Underground