A bizarre house filled with an astounding array of collections.

This cave holds a surprisingly colorful variety of geological oddities.

A bypass decorated with large wooden troll carvings.

More than 5,000 contemporary and "historic" mustards from around the world.

A largely forgotten and touching neoclassical marble fountain overlooking a bear mound effigy.

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.

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

A cemetery housing wild west legends in South Dakota.