One critic described it as "middle Mussolini, early Ramses, and late Neiman-Marcus." Another called it an architectural "natural disaster."

These chunky stone towers out in Lake Michigan are the key to Chicago’s drinking water.

Mysterious 500-year-old tapestries depict a unicorn hunt.

Unrepaired walls from a 1920 anarchist bomb attack.

The only Civil War battle in Washington D.C. took place near this highest natural point in the city.

This $3 million model train takes you through Chicago, Seattle, and the thousands of miles in between.

The tallest The Church of Jesus Christ of Latter-day Saints temple in the world soars above the Beltway.

Outsider art meets paleontology at this roadside reptile repository.

A 98-room castle in the middle of Toronto that bankrupted a 19th century electricity multimillionaire.

The first purpose-built art gallery in the United States is once again open as a center of craft arts.

The longest escalator in the Western Hemisphere takes over three minutes to ride down.

Giant acorn-shaped 19th century gazebo from which suburban Washingtonians gazed upon the original "silver" spring.

From mining complex to industrial exhibition, this museum once played a major part in the X-Files.

The palatial McDonald's that inspired Wesley Willis.

This expansive bridge in the Canadian wilderness was originally just built for friends.

A castle built for love, and abandoned due to heartbreak.

This tiny little island has, as the name says, just enough room for its single house.

What happens when a sculptor has to find a way around a 100-year-old copyright.

This exemplar of modernist architecture is meant to captivate and inspire students of the Cooper Union.

Patrick Dougherty's fantastic living tree sculptures, mind-blowing but temporary.

A tiny piece of the Moon is embedded in this stained glass masterpiece.

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

An astounding collection of medical specimens, including bits of President Lincoln.

At 207 feet, one of the world's longest continuous escalators.