The fading, forgotten remains of a once bright and booming factory.

This iconic 1958 tower welcomes air travelers to Tucson with neon-lit letters and architectural style.

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

This church on a Tohono O'Odham reservation has stood since 1797.

A natural history wunderkammer in the middle of the desert.

This collection of neon icons is preserving Arizona's history, one sign at a time.

During World War II this was the site of an "honor camp" used as a prison for draft dodgers, Native American conscientious objectors, and Japanese-Americans—including a man who brought his case against the camp to the Supreme Court.

A reproduction of earth's many biomes.

Some of the tallest ancient American ruins continue to inspire awe and curiosity.

This striking public art installation is suspended above a public park, designed to gently move in the breeze.

The Giant Lemon of Lemon Grove.

One of corporate America's best-kept secrets is also one of the most publicly displayed.

Public opinion is still divided on this enormous sculpture in front of Baltimore's Penn Station.

A symbol for the opposition to nuclear power around the world.

This colorful artistic feature atop a Danish art gallery allows visitors to stroll through a rainbow.

Danish tourist destination well known for open stalls where vendors sell marijuana on the street.

A perfectly circular stronghold constructed in the 10th century is now a nucleus of Viking culture housing a museum, village, and reenactment of an epic Viking battle.

Old Danish castle immortalized in Shakespeare's Hamlet.

A 19th-century subterranean reservoir repurposed as a contemporary art cave.

This bridge's unique architecture honors nautical heritage and encourages self-awareness.

The only surviving piece of Copenhagen's 16th-century defensive wall.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

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

Illegal drag racing two stories beneath Chicago’s streets.