The ruins of the largest gladiatorial school in Rome are largely hidden under modern streets.

This hydrochronometer was invented by a Dominican monk and is a prime feature in this garden.

Museum dedicated to literary greats of the Romantic Period is also the home in which Keats met his untimely end.

Magical-looking cottages that inspired one of the most famous animated films ever.

More than 2,000 species of tropical plants call this nature preserve and sanctuary home.

A priest with no formal artistic training used basic house paint to create gorgeous religious scenes inside this historic church.

The only royal palace on U.S. soil has been a territorial capitol, a military headquarters, and a prison for a queen.

A meditative space out of a fantasy story.

Prone to disastrous fires, the city of San Francisco has the Guardian, a fireboat gifted by residents, to watch over them from the bay.

Masterful ceramic fountain and map of the Pacific Basin.

Depicting scenes of everyday life - and specific individuals - in Great Depression era San Francisco.

This print shop boasts one of the largest pinball arcades in San Francisco.

The rustic cabin-like decor of this Arts and Crafts-style church reflects the love of nature central to its little-known theology.

A pair of mutilated bronze octopuses slump at the base of the monument honoring California's admission to the U.S.

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

A library built during San Francisco's pioneer times is a student's retreat, bibliophile's sanctuary, and chess player's delight.

The giant pair of sexy legs sticking out the window of this costume store have become its main draw.