I was reading the wikipedia article on Lady Penelope from the famous british puppet series Thunderbirds (don't ask why, but i'll give you a small hint: it has to do with nostalgia) and I discovered the following line about her house:

"Creighton-Ward Mansion was designated a Grade One listed building by the World Heritage Organization"

so there you have it folks. Lady Penelope's house is world heritage. We should go visit it as quickly as possible :p ;)