This 1960s kinetic artwork has been restored and is once again whirling away in downtown Minneapolis.

Quite possibly the last cross all humans will ever see.

This miniature feudal castle was built on a whim to honor a US Navy pioneer.

The US Navy's only submarine museum is also home to the world's first nuclear submarine.

This old residential building was once the largest flour mill in the world.

A sprawling outdoor museum filled with larger-than-life works of art.

A mysterious monument meant to be a guide into "an Age of Reason" was destroyed after an apparent bombing.

The world's first time capsule lies behind a welded steel door in Atlanta.

Atlanta's strange assortment of concrete pillars inspires reflection in some, confusion in others.

This natural spring not only claims to heal the wounded but it has also been willed to God.

An old train trestle re-imagined as an Egyptian obelisk.

This titanic steel chain linking two buildings was installed without permission but instantly beloved.

The world's largest fire hydrant is supposedly tornado-proof.

This psychedelic tromp l'oeil seems to be beckoning drivers to crash into a wall.

The record holder for the world’s largest peach.

The space-age building is home to one of the few remaining rotating restaurants in America, and the only one that inspired a 1980s sitcom.

A little stop along the Texas highway where Rock Hudson, Elizabeth Taylor, and James Dean stayed while shooting the 1955 film "Giant."

A goddess-topped water fountain in Chicago was created thanks to the dreams of a thirsty newsboy.

What's left of the ruins of the 1893 Columbian Exhibition, or World's Fair, also known as the White City.

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

In one Chicago park, a trio of werewolves are waiting to devour their fallen brethren.

This translucent sculpture represents a quintessential component of New York City's skyline.

This unmarked and unloved Manhattan subway grate created one of the most iconic images in American cinema.

Strange beasts lurking in a garden are all that remain of a quirky, short-lived theme park.