What is the most expensive thing in the world 2021?

Let’s see what they are:

• ‘Rhein II’ (photograph), 4.3 million USD.
• 201-carat gemstone watch, 25 million USD.
• Gold-plated Bugatti Veyron, 10 million USD.
• Villa Leopolda, 506 million USD.
• ‘Dead Shark’, 12 million USD.
• The domain ‘Insure.com’, 16 million USD.
• Magnetic floating bed, 1.6 million USD.
• Crystal Piano, 3.2 million USD.