The Taj Mahal
Shah Jahan had three wifes, but his favorite was Mumtaz Mahal. Unfortunately in 1631 Mumtaz Mahal died giving birth to the couples 14th child.
The Taj Mahal cost around 8 billion dollars. At the time Shah Jahan could not afford it. So he spent the rest of his life in prison.
When Shah Jahan died he was buried by his wife in the magnificent mausoleum for eternity.