A whimsical sensor instrument for Minneapolitans to play on their walks to work.

Enter the Forest of the Elves.

An architecturally-focused antique shop.

No one's quite sure where this quirky university tradition originated.

A pocket of Buenos Aires with an unusually high concentration of psychotherapists.

A vast necropolis where you'll find the elaborate mausoleums of Argentinian tango stars.

A bright little alley in La Boca is a part of tango history.

The celebrated eyesore created by starry-eyed sweethearts.

This statue was given to France by the United States to commemorate the centennial of the French Revolution.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

An enormous artwork that colorfully celebrates over 150 years of US military achievements.

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

The grand, column-fronted, sculpture-adorned home of the ambitious digital library.

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

The taxidermied remains of the "last wild grizzly bear in California" and of the symbol of the state of California.

Forgotten and then destroyed by fire, this was once one of the largest saltwater swimming pools in the world.

A masterpiece in Golden Gate Park by virtue of the artist’s debt.

San Franciscans leave gifts and messages for the magical beings that live behind the tiny, mysterious door installed on a tree in Golden Gate Park.

A famous alternative culture epicenter and where Joplin serenaded young hippies.

One of few lasting examples of the brief octagon craze that developed into folly.

Russian history in San Francisco.

Join the circus for a few lessons to learn clowning, acrobatics, and Chinese contortion.

Radioactivity still cause for concern at this urban explorer's paradise.

A brooding mansion of clinker brick stands out among the Victorian houses of Pacific Heights.