EXHIBIT 23.3 Consent of Independent Public Accountants As independent public accountants, we hereby consent to the incorporation of our reports, dated February 28, 2000, on Iron Mountain Europe Limited's financial statements included in this Form 10-K, into Iron Mountain Incorporated's, a Pennsylvania corporation, previously filed registration statements on Forms S-3 (File Nos. 333-91577 and 333-72191) and S-8 (File Nos. 333-43787, 333-69859 and 333-95901). /s/ RSM Robson Rhodes RSM Robson Rhodes Birmingham, England March 27, 2000