The Ashoka pillar and Mayadevi Temple are the core of this WHS but all around it on the masterplan of a Japanese architect, Buddhist monasteries and temples are being built from all over the world and most are well worth a visit. Some are still under construction but already judging from what has been built this is going to become THE most important place for Buddhism in the near future. I also visited Tilaurakot (28kms away) which lacks the attention and gardening that Lumbini enjoys. It surely deserves to be added as a WHS with Lumbini even though a few ruins are what is left of ancient Kapilavastu