The "Greatest Sewer" of ancient Rome is one of the oldest sewer systems in the world, and is still in use.

One of several skulls claiming to belong to the beheaded St. John the Baptist is on display at this Roman church.

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.

Nuclear waste dump site now an environmental sanctuary.

Visible below the waves are memorials to the city's Gold Rush dead.

A huge musical instrument played by the ocean.

Perfect your fly fishing technique on their practice ponds.

The second building of its name to occupy this location might be the finest flatiron building in San Francisco.

Guns that have been defending San Francisco since 1904.

A still functioning vaudeville carousel that has operated for over a century boasts a colorful menagerie and past.

San Francisco's oldest surviving monument and meeting place for 1906 survivors.

Tiki luxury on Nob Hill.

Get lost in this haunting fairytale art walk through a man-made eucalyptus grove.

Gold Rush-era tombstones line the park's paths.

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.

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

San Francisco's first World's Fair, dedicated to the wonders of California.

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

A bypass decorated with large wooden troll carvings.

A lovely hidden waterfall right off the highway is well worth a stop.

A giant, Gilded Age mansion that once belonged to the beer baron of Milwaukee.

Restaurant in Northern Wisconsin comes with a unique feature: a grassy roof covered in living goats.

The arboretum whose marshy soil sucked up the dreams of housing developers.