The last masonry skyscraper ever built reveals a transitional moment in architectural history.

The vaulted ceiling is home to a scurry of “squirrelgoyles.”

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

This 1967 experiment in modular architecture was designed to be a new model for urban living.

Immortalized in bronze, this frazzled student will be glued to his screen for centuries.

This massive circular sculpture may not be a portal to other worlds, but it does inspire the mind to imagine them.

A 20-foot statue reminds viewers of an extinct species.

A fragment of one of history’s most famous walls stands as a reminder of unity in a culturally divided city.

The only example of a Paris Métro sign in use at a subway station outside of the French capital. 

This massive stained-glass masterpiece is thought to be the largest Tiffany dome in existence.

This museum houses an imposing skeleton army comprised of creatures great and small.

The world's third-largest scale model of the planets.

A collection of 11 million buttons illustrates the human toll of the Holocaust.

These Depression-era WPA sculptures have made a couple of stops over the years.

Today this bizarre rooftop phone booth seems like a piece of kitsch but it was once used to spot disastrous storms.

Eclectic collection of rare and beautiful stones in a historic home.

The world's largest anatomically accurate brain sculpture.

It's a unique monument honoring a great character who inspired a generation of young women to be more and pursue their dreams.

This elegant arc of a waterfall marks a religious turning point.

The picturesque birthplace of Icelandic democracy is drenched in the blood of its brutal past.

This eye-popping Icelandic crater lake is surrounded by red volcanic rock.

This valley of hot springs and boiling mud pots is home to the record-holding "Geysir," which originated the English word.

If a glacial river suddenly diving into a sheer chasm via a dramatic, multi-stage waterfall isn't peak Iceland, it's certainly close.

A tiny village church in dramatic surroundings.