In this historic region, homes and churches are carved into ancient volcanic rock formations.

The best-preserved ancient theater in the world.

The topiary maze at the Habsburg hunting lodge.

Vienna's giant wonder wheel had a starring role in one of the greatest noir movies of all time.

Before it was buried by volcanic ash, this fast-food restaurant fed the hungry hordes of ancient Rome.

Two stone columns flank the grand Venice square, but there were supposed to be three.

Hamburg's first legal sex work is relegated to a gated street that still does not allow pedestrian women.

Réunion Island's highest point is a two-million-year-old volcano and a paraglider's paradise.

At the center of an island in the middle of the Indian Ocean is a deep chasm ringed by tall waterfalls.

On one of the world's most active volcanoes, a pebble-filled crater changes color with the wind.

At the foot of an active volcano sits a church miraculously spared by its lava.

A popular European tradition makes its way to the states on one of America's most famous bridges.

Elevated freight railway turned wildly successful urban park.

Two large-scale sculptures of Adam and Eve greet visitors in the nude at the Time Warner Center in NYC.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

Massive puppet-automaton machines created by French artist collective Machines de l’Ile.

Even France's favorite aquatic son Jacques Cousteau, couldn't get to the bottom of it.

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

The floating gallery illuminates the heart of Québec City's arts district.

This chilly Canadian hotel has a four-month lifespan due to the unusual material it's made of.

A reconstituted ancestral village of the Huron-Wendat Nation.

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

A massive Montreal stadium that has seen nothing but trouble since its inception.

This public art pays homage to the baseball legend and civil rights icon and his time in Montreal.