Indianapolis Catacombs are approximately 20,000 square feet of underground passageways on the northeast corner of Market and Delaware streets in downtown Indianapolis, Indiana. The passages and walkways include brick archways and limestone columns that were part of Tomlinson Hall, a building destroyed by fire in the 1950s. Tomlinson Hall was a public auditorium located immediately west of the Indianapolis City Market. Some tours were given in early 2012, and more are planned for later that year. The purpose of building the Indianapolis catacombs in the 1880s is unknown.