Location: Mumbai, India
Price: $1 billion

Mukesh Ambani, the richest person in India, built the 27-story tall Antilia for him, his wife, and their two children. The lavish skyscraper includes every amenity imaginable, from helicopter landing pads, to a theatre, to a spa, and is decorated with lotus and sun motifs throughout. The family has received criticism for the gaudy display of wealth that contrasts starkly with surrounding poverty.