Knoxville’s architectural icon was the symbol of the 1982 World’s Fair, even catching the googly eye of Bart Simpson.

The largest earthwork effigy in the world.

This spire on an Austrian mountain is wrapped around a long spiral slide and has the world's tallest wooden observation deck.

This Art Deco fortress in upstate New York gives Manhattan's vaunted examples of the style a run for their money.

This Niagara Falls tourist trap is a world bright with neon and curiosities that will inspire love, hate, or a mixture of both.

This magnificent Cincinnati graveyard is also a popular public park.

What is it about mushrooms that makes people wish they lived inside of them?

An obsolete, vanishing traffic device warns Cincinnati drivers away from middle-of-the-road obstructions.

This humble star-gazing center touts itself as the "Birthplace of American Astronomy."

An art deco ice cream shop covered in vintage tiles.

A grand Gothic Revival basilica with stained glass depictions of Montreal's religious history has only one soul resting in its crypt.

The world's most important buildings shrunk to a tiny size.

The "Prussian Versailles" that is as glorious today as when it was built.