This posh mansion began as a family's estate and ended as the site of a murder ripped from the pages of a pulp novel.

Tirelessly maintained by a Wisconsin man named JFK.

17,400 lbs., 12 feet in diameter, and 29 years in the making.

This Minnesota town celebrated the state's 100-year anniversary by creating a massive ode to nature's smartest bird.

A bronze statue on a downtown corner honors Minneapolis's favorite career gal.

This statue of Olympic hockey coach Herb Brooks immortalizes one of the greatest moments in American sports history.

A remote hill on a stretch of country road where the laws of physics are defied... or so it seems.

There aren't too many operational funiculars around, but Pittsburgh has two!

This unusual structure may be on its way to becoming a cultural landmark in Toronto.

This massive, ancient stone was disassembled and then put back together again.

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

This Toronto garden collects stares and tchotchkes in equal measure.

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

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

A monument to the 17,000 Chinese who worked and died to build Canada's Pacific Railway.

What was once the largest mine in North America has left behind a hollow hill filled with bright blue waters.

The mastermind behind this palatial hotel perished on the Titanic weeks before its grand opening.

This inexpensive lodging house was once a prison notorious for its inhumane practices.

Louise Bourgeois' 30-foot-tall steel spider sculpture.

Futuristic apartment blocks are the backdrop for Montreal surfers hangin' ten on the Habitat '67 standing wave.

City law dictates that this mountaintop cathedral containing the heart of a saint is to remain the tallest building in town.

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

This 1967 experiment in modular architecture was designed to be a new model for urban living.

Designed by Buckminster Fuller, this relic of the 67 Expo survived fire and ice.