Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

Amid the sprawling Defense Intelligence Agency Headquarters is one of Washington's least accessible museums.

This small city where almost everyone lives in the same building can only be reached via North America's longest tunnel.

This WWII-era military installation once held an entire city within its walls - now, its walls are falling down.

The ghostly remains of what was once the world's richest copper mine.

This lighthouse and shipwreck museum keep a torch burning for the memory of the SS Edmund Fitzgerald.

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

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

Named after the Goddess of Harvests, Annapurna is the deadliest member of the Eight-thousanders club.

Last stop before the top of the highest peak in the world.

Jumping-off point for a climb up Mt. Everest is the most dangerous airport in the world.

A monument to the three wars that led to German unification towers within a Berlin traffic circle.

Berlin's old airport.

An abandoned NSA listening post on Berlin's "Devil's Mountain."

42nd story Pyramid shaped penthouse tops Seattle's oldest skyscraper.

Come for the waffles, stay for more waffles.

You don't have to be an ambassador to dine like one.

A crumbling staircase in upper Manhattan is all that remains of one of the most important sites in sports history.

One of the last full-orchestra recording studios in New York City and an acoustical marvel.

An uber-secure, windowless tower of doom in the center of Manhattan is an NSA spyscraper.