Early prototype for Frank Lloyd Wright's Guggenheim.

A modest reminder of treacherous waters at the Golden Gate.

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

The key to turning shifting dunes into the green oasis of Golden Gate Park.

San Francisco's urban bison herd has persisted in the face of extinction, development, and disease.

Home to one of the world’s largest collections of model yachts.

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.

The remains of a ruined mansion memorialize the 1906 earthquake.

A monumental cross hides in the trees in Golden Gate Park.

Thirteen trees representing the original thirteen colonies were planted with soil from historic Revolutionary battlefields.

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

San Francisco’s century-old Christmas Tree.

England's most famous front door has an accidental doppelganger.

This giant middle finger statue sends an unambiguous message to Italy's bankers.

Millions of numbers carved in glass represent the tattoos forced upon victims.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

The American Revolution was galvanized into serious action due to the tragic clash with British soldiers that occurred at this location.

This massive tea kettle was once a promotional stunt for the Oriental Teashop.

This statue intended for children to enjoy became a minor political spat.

One of the oldest used bookstores in the U.S. has been selling antiquarian treasures since 1825.

In the 19th century, this was the center of Boston's Black community.

Mrs. Mallard and her brood are a beloved fixture in Boston Public Garden.

The Boston square dedicated to the dark poet who was born nearby.