The tomb was a relic of the first settlers in the Spanish Cristovo de Cea region and was originally built some 4000 years before the birth of Christ. Every builder, tradesman and DIY enthusiast knows the embarrassment of making a howler on the job, whether it's taps installed the wrong way round or a wonky shelf. But few will know the sheer panic these Spanish workmen probably felt when they discovered they had smashed up a 6,000-year-old Neolithic tomb and replaced it with a concrete picnic table. The tomb was a relic of the first settlers in the Cristovo de...