Once the largest windmill outside of Holland, with enormous 114 foot sails.

Approximately 250,000 people left homeless by the great earthquake and fires found shelter in Golden Gate Park.

Once the site of speeding horses, now home to picnickers and public concerts.

An elaborate gift from Claus Spreckels is now a piece of San Francisco history.

San Francisco's first World's Fair, dedicated to the wonders of California.

San Francisco's oldest surviving monument and meeting place for 1906 survivors.

The remains of a ruined mansion memorialize the 1906 earthquake.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

This concrete tangle of square pipes has stood as a proud thorn in the city's side since the '70s.

The second building of its name to occupy this location might be the finest flatiron building in San Francisco.

A journey begins with a single step, and for many, the road-trip of a lifetime started at this Chicago intersection.

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

The last remaining vestige of a popular 1999 public art display.

A spectacular remnant of an Adler and Sullivan masterpiece that was destroyed in 1972.

The twin towers in this Chicago fountain use 50 foot tall video screens to spit on people.

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

The Hanshin Expressway goes right through its 5th, 6th, and 7th floors.

Closed for decades, this strange symbol of Japan's Expo '70 has finally opened its psychedelic insides to the public.

Hidden beneath the famous St. Peter's Basilica is a veritable city of the dead that may hold the remains of St. Peter himself.

Above the heads of passersby stands a small statue commemorating soldiers from the Boer War.

Three connected pink triangles memorialize persecuted gays and lesbians throughout history.

The facade of this bank has changed little over the centuries, including its unique welcome sign.

A pillar is all that remains of a church built to honor a peculiar miracle.

An Amsterdam street lined with antique shops each one dedicated to a different obscure collection.