Illegal drag racing two stories beneath Chicago’s streets.

Over 1,000 pieces of one of the most niche art objects imaginable: the glass paperweight.

An outdoor urban gallery of large-scale artworks by the world's most influential street artists.

This $3 million model train takes you through Chicago, Seattle, and the thousands of miles in between.

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

A gothic church spire sits atop this skyscraper, the tallest church in the world.

A 400-foot-tall tall map of Chicago makes this once-ignored building stand out.

Each of these gorgeous, intricately decorated rooms is painstakingly crafted to the scale of 1 inch: 1 foot.

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

A goddess-topped water fountain in Chicago was created thanks to the dreams of a thirsty newsboy.

One of Antoni Gaudí’s earliest buildings, built between 1886 and 1890 for the industrialist Eusebi Güell.

27-room home built with the fortune of a sugar magnate.

Home of modern dancer famously strangled by her own scarf.

Where a demonstration led to equal rights for one of California's most marginalized communities.

The miraculous hydrant that saved the Mission District in 1906.

The sole surviving relic of the San Francisco neighborhood cobbled together from old horsecars and streetcars.

Guns that have been defending San Francisco since 1904.

At the base of the Golden Gate Bridge, a small sign basically begs for a high-five.

Beneath the southern end of the Golden Gate Bridge is the “Gibraltar of the West Coast,” a fort built to protect the San Francisco Bay from naval attack.

The only visible piece of San Francisco's most famous shipwreck.

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

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

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

The remains of a ruined mansion memorialize the 1906 earthquake.