A hollow cement depiction of time's inexorable effect on the human body.

One of the largest pieces of scientific equipment ever carried on a NASA space shuttle sits in a Chicago alley.

This unauthorized stone mermaid was secretly carved out of public stone before being permanently preserved.

A haunting statue called "Eternal Silence" has quite the reputation among visitors with active imaginations.

Shop of curiosities with a dinosaur museum tucked in its basement.

Arguably the best example of an authentic Dutch windmill in the United States, rivaling its counterparts in the Netherlands.

A replica viking ship from the Chicago World's Fair is still in dry dock in an Illinois park.

The face of a woman pushes its way through the earth.

A six-story-tall golden pyramid, surrounded by a moat.

The birthplace of a titan of American cinema.

The spaceship-like theater, which is still in use, was one of the most popular exhibits at the 1964 New York World's Fair.