Diagon Alley, Ninjago City Gardens, the Santiago Bernabéu, the Taj Mahal, Hogwarts Castle, the AT-AT, the Millennium Falcon, the Colosseum, the World Map and the Titanic. It was a lot of fun.

The most expensive retired Lego sets can fetch up to five figures. Among the most expensive include sets themed after Star Wars and major world landmarks like the Taj Mahal. What makes certain ...