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

A historic Montreal market that was the city's agricultural hub for over century.

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

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

This mesmerizing kinetic sculpture blossoms endlessly in the breeze.

Immortalized in bronze, this frazzled student will be glued to his screen for centuries.

Montreal's giant farmer's market is a foodie's best friend, especially in the winter months.

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

The biggest museum dedicated to insects in North America, one of the largest in the world.

Instruments, apparatus, and rare books all relating to chemistry and its related sciences.

One of Philadelphia's largest murals resides hidden under this bridge.

This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.

Step into a pastel time capsule where candy is truly dandy.

Mural made of 100,000 pieces of hand blown glass, and until recently, the largest glass mural in the US.

The preamble to the U.S. Constitution written entirely from vanity license plates hangs in the Smithsonian museum.

Light bulbs, scrap wood, and tinfoil comprise this homemade throne of the gods.

A hidden passageway now marks the site of an assassination attempt on Ronald Reagan that some say broke a 140-year-old curse.

A brass and marble scale model of the solar system embedded in the concrete.

This bridge over D.C.'s Rock Creek Park is sometimes called the "Buffalo Bridge" because of its four buffalo sculptures, which were cast from a single piece of bronze.

A diminutive memorial marks the site of a successful assassination by a right-wing death squad in America's capital.

A public art jibe at one of the United States’ oldest and longest-serving senators.

Before founding the American Red Cross, Clara Barton had a tremendous humanitarian impact by locating thousands of missing soldiers.

Fittingly, America's museum of architecture is itself a magnificently designed old building.

Railroad officials in the early 1900s sought to spare travelers the sight of Roman soldiers’ private parts.