One of the foremost Sherlock Holmes collections is hidden away at a Toronto library.

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.

The unbelievably opulent home built for an infamous newspaperman.

A walk-in working camera obscura produces 360-degree live images of the San Francisco coast.

The headquarters of a secretive order is also a beautifully-designed park.

Staircase winds down the side of Telegraph Hill through gardens, wild parrots flying overhead.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.