Golden Gate Park's historic collection of plants.

The remains of a 12th-century chapter house in Golden Gate Park.

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.

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

Relics of the 1894 Midwinter Exposition continue to delight visitors today.

A modest reminder of treacherous waters at the Golden Gate.

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

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

This private residence was the template for one of the most beloved television homes of all time.

A huge musical instrument played by the ocean.

San Francisco’s century-old Christmas Tree.

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

A collection of 20th-century automata, penny arcade games, and musical contraptions.

Carnivorous plants, medieval aphrodisiacs, and the largest original wood structure glass conservatory in the western hemisphere.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

A psychedelic labyrinth on the San Francisco bay.

A nondescript building that's been functioning as a speakeasy for nearly a century and a half.

Chevron maintains one “Standard” brand station per state so it doesn’t lose the trademark.

San Francisco's oldest operating hotel, with a Victorian atmosphere and a "haunted" fourth floor.

This demon atop the Notre-Dame de Paris looks utterly bored.

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

A museum of carnival attractions where you are invited to ride the rides.

A beautiful Victorian statue shows France's enduring love of the rhinoceros.

This museum houses an imposing skeleton army comprised of creatures great and small.