There’s a hidden military meme engraved on the World War II Memorial.

This stunning blue and gold room changed cities twice before becoming part of the Smithsonian.

The beloved statue at the National Academy of Sciences is oh so inviting to sit on.

The walls of the iconic dome are hollow and have a secret stairway.

The winding route passes through an enclosed alleyway, two tunnels, and leads to the White House basement.

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

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

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

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.

Canada's largest graveyard boasts a lot of noteworthy artifacts as well as its own computerized mapping service.

One of the oldest of its kind.

A tour de force of a fountain, memorializing a man who loved fountains more than anything else.

This elaborate towering structure was once famed for its revolutionary height.

Yo, Adrian!

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

A spectacular remnant of an Adler and Sullivan masterpiece that was destroyed in 1972.

A 400-foot-tall tall map of Chicago makes this once-ignored building stand out.

Once called the "Polish Gold Coast" it is an icon of the neighborhood that bears its same name.

Illegal drag racing two stories beneath Chicago’s streets.

This urban drawbridge gained eternal pop culture fame when the Blues Brothers jumped it while it was raised.

Home to a protest movement, a bombing, and a dramatic change in labor history.

The twin towers in this Chicago fountain use 50 foot tall video screens to spit on people.

The subtle science of a master molecular gastronomist.