Hmm. I don't quite know. I'd say my antiques and old photographs. I have irreplaceable coins and relics up too 300 years old, some of which have many interesting back stories. Most notable are: Mint 1820 gold sovereign which my grandfather had since birth in 1920, a hand made knife from Cambodia which was made by a villager during the Vietnam war out of a 50.cal shell casing and a bit of helicopter, the photos of my great grandfather in the first world war and his trips around the world during the 20s and 30s, including the photo of him at a 'St.Georges Society' dinner, in which he is seated at a table with Amelia Earhart, and lastly the relics my grandfather brought back from Europe during the second world war including a luftwaffe Officers hat crest, a fairborn stykes commando knife, Nazi propaganda leaflets and countless photographs.