A mysterious shape catches the eye in this 16th-century painting.

Originally meant to hold a statue of King William IV, this support sat empty for years. Today, it hosts a rotating cast of public artwork.

Famously misunderstood wonder of the ancient world

Two stone columns flank the grand Venice square, but there were supposed to be three.

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

The oldest operating pharmacy in the world features 800-year-old recipes.

In Florence's great Duomo, a 26 foot fresco honors a mercenary famous for attacking Florence.

The yawning maw of this pagan visage is said to bite off the hands of liars.

The haunting complex honors the millions of Ukrainians who died in the forced famine under Soviet rule.

Martha's Vineyard's most beloved speakeasy sells late-night pastries.

Colorful clay cliffs tower over an unofficial nudist beach on Martha's Vineyard.

This candy-colored storybook village originated as a 19th-century Methodist campground.

The oldest platform carousel built in the United States continues to delight children in Martha’s Vineyard.

One of Mother Nature’s geological gems, home to many prehistoric fossils.

Canada's oldest railway tunnel is illuminated in a rainbow of color as it passes under the streets of this small city.

A tribute to the man who invented basketball stands in his Canadian hometown.

Canada's subterranean Cold War museum has doubled as a movie set.

These locks on North America’s oldest canal are named after a porcine rock formation.

This defunct Champlain Oil service station harkens back to the early days of automobiles.

A sprawling Victorian farm that has been surrounded by a capital city is one of Canada's greatest treasures.

The metal truss bridge served as the sole entry point to an "isolation island" for smallpox outbreaks throughout the 1870s and early 1940s.

A 1995 memorial acknowledges the tremendous contributions of Vietnamese refugees to Canada.

These prehistoric replicas were based on actual skeletal remains.

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