The oldest landmark of Toronto is a testament to shifting sands.

One of the largest underground systems runs under Canada's largest urban center.

This unusual structure may be on its way to becoming a cultural landmark in Toronto.

The Incredible Hulk, Yoda, Mulder and Scully, and many many others watch over the mean streets of Toronto.

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

This Toronto garden collects stares and tchotchkes in equal measure.

Smallest house in Toronto sits on a lot meant to be just wide enough for cars to drive through.

The Victorian-era greenhouse is stuffed with tropical plants, and open 365 days a year.

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

Once a year, at exactly 11:11 a.m., this monument comes to life.

A floating cat sanctuary on an Amsterdam canal.

The bridges portrayed on EU currency aren't fictional anymore.

Providing the soundtrack to the golden years of the Seattle grunge scene.

A former Latvian headquarters of the brutal KGB secret police is now open as a grim reminder of their atrocities.

This charming cobbled backstreet is the most Instagramable street in Paris, much to the residents' annoyance.

Paris' linguistic guide to the international language of, yes, love.

The works of poetry's biggest names grace the walls of the city of Leiden, all carefully painted by hand.

This public toilet built in the famous Amsterdam School architectural style is a Dutch national monument.

The world’s tallest outdoor lift stretches along the stone pillars that inspired the floating mountains in the movie “Avatar.”

This gigantic monument hidden in the woods was built to thank the Dutch for sheltering Belgian refugees during World War I.

One of the Leiden's oldest pubs is also the birthplace of the Heineken star.

A trio of red, white, and blue stones embedded in the streets of Leiden are markers of medieval territory and law.

Unsurprisingly, Holland is home to one of the most magnificent flower gardens in the world.

Built by crowdsourcing, this wooden foot bridge saved a part of Rotterdam that was languishing in wait of city funding.