One of the foremost Sherlock Holmes collections is hidden away at a Toronto library.

Overlooked by many, the two famous Scottish warriors guard the main gate of Edinburgh Castle.

This water-locked cliff face is covered in hundreds of ancient pictographs.

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

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

A memorial to the tens of thousands of Irish who fled to North America during the Great Famine.

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

Willy Wonka would love this weird half-a-home.

One of Canada's most incredible rare book collections holds hundreds of thousands of gorgeous tomes that the general public can touch.

Secret Swing.

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

This bridge was constructed from the rubble of the infamous Bastille.

A favorite Paris bar for U.S. expats, including Gershwin, Hemingway, and James Bond.

Medieval museum built over Roman baths that features famous tapestries of a lady and a unicorn.

The celebrated eyesore created by starry-eyed sweethearts.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

Every St. Andrews student knows to avoid this inscription for fear of a martyr's curse.

The heads of two giant mythological water horses honor Scotland's horselord past.

A church that bred legends, and served as an inspiration for the Da Vinci Code.

Ruined 11th century abbey built by King David I in Edinburgh, Scotland.

A six-ton wedding present for the King of the Scots.