So Expensive

Horseshoe crab blood can cost $60,000 a gallon, but why? Turns out the prehistoric arthropod is the key to making sure that vaccines are safe for human use, but some people are raising questions about the long-term effects of blood harvesting.

Koi fish are colorful patterned common carp that are now celebrated in annual koi shows and kept in ponds all over the world. But did you know that some are worth MILLIONS?

Rolex watches are some of the most sought-after timepieces in the world. Last year, a vintage Rolex Daytona worn by Paul Newman was sold at auction for $17.8 million. Cara Barrett, editor at Hodinkee, fills us in on why Rolex's are so pricey.

Vanilla prices have climbed so high it's worth more by weight than silver. This increase in price has to do with a number of factors, including vanilla bean theft, complex pollination, extreme weather, and the rise of the "all natural" food movement.

Christian Louboutin's trademark red-bottomed shoes have become iconic. Beyoncé wore a custom pair of boots for her Coachella performance, and Cardi B slipped on a pair of "bloody shoes" for her "Bodak Yellow" music video. But why do these heels cost hundreds, and sometimes thousands, of dollars?

A tuna once sold for $1.8 million, but you can get cans of tuna fish for less than $2 at the grocery store. So, what's the difference? Bluefin tuna can be very expensive depending on where you buy it and which part of the fish you are eating. We spoke with the chef at Shoji in New York, Derek Wilcox, to find out why the fish is so expensive.

The deathstalker is one of the most dangerous scorpions on the planet, and what makes it so dangerous also happens to be the most expensive liquid in the world. But why?

A wheel of parmesan cheese can cost over $1,000. A single wheel takes at least one year to age, 131 gallons of milk to make, and it can only be made in a restricted area in northern Italy, in the region of Emilia Romagna. We visited a dairy in Parma, Italy to find out how the cheese is made and why it is so expensive.