Soon known as Herrick's Folly, it was sold in 1865 because of maintenance costs.

The tower on the approach to the summit is known as Carden's Folly.

It eventually came to be known as "Vanderbilt's Folly".

The canal took 66 years to construct at a cost of £80,000, and became known as "Smeaton's Folly".

Archer's building work created only a shell that became known as Archer's Folly.

As a result of the scepticism at the time the plane became known as Freeman's Folly.

However, his fortifications were useless, and therefore it was known as Collyer's Folly.

Due to this, they were known as "Cockcroft's Folly" by workers and engineers.

American public opinion was not universally positive; to some the purchase was known as Seward's Folly.

The reservoir was dismissed by some as a waste of money, and known as "Gadie's Folly".