An ancient Egyptian temple in the middle of Madrid, Spain.

Noble beasts perhaps, but not the Emperor's dogs.

Two pillars set 10 paces apart commemorate the "last notable American duel."

Once the site of speeding horses, now home to picnickers and public concerts.

Barely visible foundations remain where Stow Lake’s “observatory” once welcomed visitors.

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

Frank Lloyd Wright died a year before construction on his largest public project even began.

Guns that have been defending San Francisco since 1904.

Art in the form of a winding, man made crack in stone.

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.

This posh mansion began as a family's estate and ended as the site of a murder ripped from the pages of a pulp novel.