Eons old volcanic activity created one of the most stunning rock formations in the United States.

This naturally heated mountainous creek has created a group of neon blue pools of potentially deadly boiling water.

Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.

A bigger-than-life pun that has become a beacon of altruism.

The site of a classic series of Laurel and Hardy pratfalls.

One man's homage to the sun continues to grow like a glass fractal.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

In a city filled with Frank Gehry buildings, one stands out as one of the architect's weirder works.

A complex of six forts embedded in the Rajasthan hills.

More than half of this Indian palace is drowned but it looks all the more spectacular for it.

An extraordinary "City of Caves" carved from solid stone.

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

Willy Wonka would love this weird half-a-home.

One of the largest underground systems runs under Canada's largest urban center.

One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.

The bones of an old zoo crumbling in the shadow of a new one.

The Beaux-Arts aquarium boasts a vast collection of saltwater and freshwater fish on an island in the Detroit River.

A wacky two-story folk-art assemblage of carved and found objects, with lights, motion, and sound now in need of financial support.

This whimsical Oz-themed park had a wonderful impact on the surrounding neighborhood.

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

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

The fifth-longest suspension bridge the world, connecting one Michigan peninsula to another.

Large one-man sculpture park in Michigan.

House built with over 60,000 glass bottles.