Below the colonnades are catacombs which were originally conceived as a cheaper alternative burial to having a plot in the grounds of the cemetery. Unfortunately, the catacombs were not a success and only about 500 of the many thousands of places in them were sold. The Metropolitan Interments Act 1850 gave the government powers to purchase commercial cemeteries. The shareholders of the cemetery company were relieved to be able to sell their shares as the cost of building the cemetery had overrun and they had seen little return on their investment and there were few burials at first.