Jewel box is a term sometimes used in reference to the group of Major League Baseball ballparks built (or re-built) primarily between 1909 and 1915, after the wooden ballpark era and before the modern multipurpose stadium era.
These parks featured two-tier grandstand design to take advantage of the steel structural supports and often squeezed inside a city block bringing fans right on top of the action.
The "retro" ballparks constructed in the 1990s (and later) were an attempt to capture, to some degree, the perceived intimacy and baseball focus of these parks.
Here is a list of the jewel box ballparks, their dates of use as a Major League Baseball facility^ (see note below), and some indication of their remnants, if known: Boston Brooklyn Chicago Cincinnati Cleveland Detroit New York Philadelphia Pittsburgh St. Louis Washington ^Unless otherwise noted, first and last years listed include entire baseball season in that year.
Jewel box parks were used during the era that saw the Major Leagues begin playing games at night.