Possible Clues:

• Springs over for the underground
• Pommel horse maneuvers
• Some storage areas
• They're bound to be in the basement.
• Safes
• Bound to get over them underground
• Jumps with aid of pole
• 'A paper currency is employed, when there is no bullion in the --' (Emerson, Nature)
• Arched ceilings or underground chambers
• Strongrooms having five defects: not the first