I visited this WHS in June 2014. I spent 3 splendid days living in a trullo in Aja Piccola, which is the residential quarter where most locals live. It's like stepping back in time with several old cars from the 60s and 70s parked outside the trulli. I visited the commercial quarter, Rione Monti, early in the morning and late in the afternoon/evening when all the tourist groups were gone or hadn't yet arrived. I visited many trulli to see the different interior designs and I must say that the ones in Aja Piccola are definitely not to be missed. The Trullo Sovrano and Casa Lippoli have been converted to museums but both are worth a visit. The Trullo Siamese is more interesting from the outside than the inside and the same applies to the quaint church in Rione Monti. The views overlooking the 1000+ trulli from here are worthwhile but the best views are from the Belvedere near Piazza del Popolo or the public gardens nearby. Unless you spend at least a night in a trullo in Alberobello wandering from one trullo to the next, gazing at the different pinnacles and white painted signs (Christian, Jewish or Pagan) on the trulli, to experience "slow tourism" at its best ... you will miss out and you will end up looking at Alberobello as a tourist trap without realising all this surreal WHS needs to reveal its OUV is TIME!