This palatial spiral staircase was so unusual the name "snail" was given to the noble family who built it.

Venice's "Island of the Mad."

Go inside to really appreciate this 500-year-old technological masterpiece.

This community on a small Venetian island has taken to painting their houses in bright neon hues.

This former train tunnel is filled with lines from a poem crafted by Robert Louis Stevenson.

In 1909, the steepest and most difficult piece of track on the Canadian Pacific Railway was replaced with a series of spiralling tunnels cut into the mountains.

A small granite monument marks where the borders of three countries meet.

If you visit Santa's village, you can get your passport stamped to show you crossed into the Arctic Circle.

This stone incorrectly marks the 35th parallel, causing some territorial kerfuffles.

This country market harbors goats on its roof.

The 5,000-year-old megalith is believed to be Scotland's tallest standing stone.

The true age of this ancient stone circle is unknown, but its stunning vista isn't in question.

The mysterious megaliths have enchanted and intrigued visitors for thousands of years.

This statue was given to France by the United States to commemorate the centennial of the French Revolution.

This conservatory allows a little bit of the tropics to thrive in the middle of a major Canadian city.

A working steam clock, one of only a few in the world, located in Vancouver's Victorian Gastown.

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

This Art Deco masterpiece has stood in for some of the most famous buildings in comic book history.

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

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

The longest enclosed pedestrian bridge in the world spans 14 lanes of traffic and six rail tracks, all while lighting up the night sky.

The natural hot spring that was integral to the creation of Canada's first national park.

A massive Montreal stadium that has seen nothing but trouble since its inception.

The oldest candy store in the world has been selling traditional sweets since 1827.