This prehistoric sinkhole lured exclusively male mammoths to their death, much to the delight of science.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

Hidden behind Lincoln's head is a 70-foot-long chamber containing enamel plates documenting American history, sealed in a teakwood box in a titanium vault.

This secret gem of a toy store houses a rideable carousel populated with fantasy animals.

This punny mirror of another Wisconsin attraction is exactly what it sounds like.

Giant six-pack could provide one person a six-pack a day for 3,351 years.

A bizarre house filled with an astounding array of collections.

While there are no actual snakes in the history of this crooked road, there may be a number of dead horses.

The Iowa state contender for largest pan in the world oddly only comes in second or so.

The sea once considered an ecological wasteland is now called "crown jewel of avian biodiversity" by scientists.

The ghostly remains of an accidental sea.