This still-celebrated home was a radical architectural experiment in 3D De Stijl.

Colorful and chaotic stacked hotel in North Holland.

This gorgeous reading room houses the oldest and largest art history library in the Netherlands.

One of the world's largest telescopes, stares into the night sky with two huge mirrors.

Witnessing the might of this dessert-colored desert waterfall is a rare, powerful treat.

America's only nuclear missile silo open to the public.

See massive fossils that are over 200 million years old in northeastern Arizona.

Most-visited and most-photographed slot canyon in the American Southwest.

Rippling sand dunes frozen in the Arizona rock.

An ancient city exhumed from the depths of the ocean.

Genesis of modern hydroelectric power.

A large grotto built in the 16th century amidst Florence's famous Boboli gardens.

A brutalist gem towering over the heart of Milan.

Stare out over the lagoon and beyond from this 10th-century campanile on the island where the city of Venice began.

A new sculpture calls attention to climate change in the centuries-old city it threatens.

This sturdy, circular stronghold served as one of the forts that protected the Venetian Lagoon.

This palatial spiral staircase was so unusual the name "snail" was given to the noble family who built it.

Go inside to really appreciate this 500-year-old technological masterpiece.

As can be expected from a centuries old church built in a canal city, the undercroft of this house of worship is beautifully flooded.

The concrete shell of an industry giant remains as a playground for graffiti artists, auto scrappers, and paintball warriors.

A Beaux-Arts triumph set to become Ford's innovation campus

The Beaux-Arts aquarium boasts a vast collection of saltwater and freshwater fish on an island in the Detroit River.

Abandoned concert venue legendary for its rock counterculture.

This sprawling bookstore spans four floors and has more than a million books in stock.