This natural sea cave hides a small wonderland of natural turquoise beauty.

This colorful creation wasn't always a welcome part of Toronto's Moccasin Trail Park.

When beetles destroyed these trees, they found new life as fantasy sculptures.

This enormous fish commemorates the unplanned release of brown trout into a Michigan river.

These sprawling mines once served as a source of plaster and today serve as a storage facility.

An angular maze of concrete in Grand Rapids acts both as public art and as a staircase for fish traveling upstream.

The 10-foot-tall vegetables belong to Michigan’s first food rescue program.

This museum remembers an apocalyptic cult that became more famous for baseball than religious radicalism.

One lonely, modern pyramid has gone from corporate think tank to deserted boondoggle.

This water tower has been a staple of the Rochester skyline since 1931.

A book collector's dream, this Toronto bookstore has the world's first "Biblio-Mat," a random book vending machine.

Behind an abandoned storefront is an example of pioneering 1930s gas station architecture.

Light bulbs, scrap wood, and tinfoil comprise this homemade throne of the gods.

The "Key of Keys" for Washington, D.C. and the apocryphal landing place for the military campaign that started George Washington's career is now at the bottom of a well.

Bowl in splendor, if you're lucky.

An oasis of calm amid the chaos of the boardwalk, the museum traces the heritage of this beloved beachside amusement park.

A living archive of urban activism and space reclaimed.