One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.

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

This Toronto garden collects stares and tchotchkes in equal measure.

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

This Frank Lloyd Wright summer house was designed along Lake Erie as a retreat for a client's wife.

This restored house is like a time capsule of the president's unconventional inauguration.

This Buffalo museum hides an Art Deco gas station designed by Frank Lloyd Wright.

This unique crypt designed by Frank Lloyd Wright for his longtime friend was not completed in either man's lifetime.

One of Frank Lloyd Wright's greatest—and favorite—architectural masterpieces was almost lost.

The absurd creation is a compulsory destination for selfies in Buffalo.

This half-ton piece of the Alps sits at the base of the CN Tower.

I-95's Tijuana-style celebration of kitsch at the Carolina border.

The first piece of public art dedicated to LGBT rights.

The site of the deadly Triangle Shirtwaist Factory Fire.

America's oldest Eastern European synagogue provided the immigrants of crowded Lower East Side tenements a space of sanctuary.

This subterranean oyster house has been the pearl of Grand Central Station since 1913.

Unrepaired walls from a 1920 anarchist bomb attack.

The New York hotel where tragic visionary Nikola Tesla spent his final hours, destitute and alone but for the pigeons.

Visit the monolithic tomb of America's most famous general.

Spinning silently in the lobby of an Art Deco masterwork is a massive vintage model of the Earth.

A clock set into the concrete outside a Manhattan jeweler has been telling time underfoot for over a century.

This Wall Street bar was once a hub of revolutionary activity where Washington famously bid farewell to his troops.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

The oldest surviving bridge in New York City, which reopened to pedestrians in 2015.