This lovely, if imposing, piece of Canadian gothic is possibly the most photographed hotel in the world.

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

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

A fantastic place to see murals, and an important location in the history of Toronto's legal street art scene.

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

Yo, Adrian!

Huge masonic hall in Philadelphia with lavishly themed rooms.

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

Housing the National Women's Party since 1929, this historic house is now a monument to the fight for gender equality.

The 5.5-mile ring of steel posts around the Capitol Building is one of the largest (and most uniform) of its kind in the world.

"Congress may voluntarily remain in session throughout the summer, in order that our Congressmen may be protected from the intolerable discomforts and dangers of the ordinary outdoor weather!”

An overlooked memorial honoring the local Washington residents who died in World War I.

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

A building so large that it has its own weather.

Manatees congregate around a power plant's discharge canal where the water is especially warm.

These former theme park figures have a new lease on life outside a water plant-turned-restaurant.

Over 120,000 curious objects that have shaped our modern world.

Former villa and estate of James Deering developed to preserve native tropical forests.

This vacant church in the Financial District was once the heart of New York's first Syrian immigrant community.

A dark patch of the ceiling at Grand Central Terminal which was not restored is still stained brown by tobacco.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

Rat sculptures try to infiltrate the Graybar Building in an architectural tribute to New York City's nautical history.

This lesser-known Frank Gehry building houses a treasure trove of cinema history.

The remaining relics of the patroness of Paris lie in a chapel under a striking double spiral staircase.