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

This indoor ski resort has a mountain contained inside a mall.

Collapsing castle on the Hudson river was once the storage site of military surplus business.

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

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

A Montreal deli that was so beloved that it was allowed to circumvent their laws of language.

A contemporary fresco movement illustrates the region's rich history.

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

A symbol of hope, survival, and national character, especially after it rose phoenix like from the flames.

A 16th-century monastery boasts a lush array of plants native to Mexico’s most biodiverse region.

This slumbering beast honors the Bavarian soldiers who died in Greece during a 19th-century typhoid outbreak.

The historic building has preserved human organs, unusual hexagrams, and scars from a political assassination.

The Cycladic architecture makes this Athens neighborhood feel like an island paradise hidden in the shadow of the Acropolis.

This legendary city has been a tourist attraction for centuries.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

Dublin's most modern, visually spectacular bridge is modeled after Ireland's national emblem.

The modern birthplace of Irish freedom.

One of Ireland's most infamous prisons for rebels including men, women and children.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

Dublin's "Dead Zoo" serves as a window to Victorian museum design.

The Cape of Good Hope is not quite as low as you can go on the African continent, but it's still geographically significant.

Formerly known as the Malay Quarter, Bo Kaap is a colorfully-painted suburb located in the “Mother City” of South Africa.

This granite mountain is the largest rock in Africa and the second-largest monolith in the world.

A small Richmond island dotted with the remnants of hundreds of years of history.