The purpose of building the Indianapolis catacombs is unknown

Did you know that Indianapolis Catacombs are approximately 20,000 square feet of underground passageways on the northeast corner of Market and Delaware streets in downtown Indianapolis?

Several tours were given in early 2012, where visitors could see  passages and walkways of  brick archways, as well as limestone columns.

The catacombs were built back in 1880s, however,  the purpose of the building is still unknown.